Communications-based train control

Communications-based train control (CBTC) is a railway signaling system that uses telecommunications between the train and track equipment for traffic management and infrastructure control. CBTC allows a train's position to be known more accurately than with traditional signaling systems. This can make railway traffic management safer and more efficient. Rapid transit system (and other railway systems) are able to reduce headways while maintaining or even improving safety.

An underground station with two tracks in Madrid. A blue and white subway train is entering the station on the left.
CBTC deployment in Madrid Metro, Spain
An elevated station in Sao Paolo has a design like a cable-stayed bridge.
Santo Amaro station on Line 5 of the partially CBTC-enabled São Paulo Metro

A CBTC system is a "continuous, automatic train control system utilizing high-resolution train location determination, independent from track circuits; continuous, high-capacity, bidirectional train-to-wayside data communications; and trainborne and wayside processors capable of implementing automatic train protection (ATP) functions, as well as optional automatic train operation (ATO) and automatic train supervision (ATS) functions," as defined in the IEEE 1474 standard.[1]

Background and origin

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CBTC is a signalling standard defined by the IEEE 1474 standard.[1] The original version was introduced in 1999 and updated in 2004.[1] The aim was to create consistency and standardisation between digital railway signalling systems that allow for an increase in train capacity through what the standard defines as high-resolution train location determination.[1] The standard therefore does not require the use of moving block railway signalling, but in practice this is the most common arrangement.[2][3][4][5][6][7]

Moving block

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Traditional signalling systems detect trains in discrete sections of the track called 'blocks', each protected by signals that prevent a train entering an occupied block. Since every block is a fixed section of track, these systems are referred to as fixed block systems.

In a moving block CBTC system the protected section for each train is a "block" that moves with and trails behind it, and provides continuous communication of the train's exact position via radio, inductive loop, etc.[8]

 
The SFO AirTrain in San Francisco Airport was the first radio-based CBTC system.

As a result, Bombardier opened the world's first radio-based CBTC system at San Francisco airport's automated people mover (APM) in February 2003.[9] A few months later, in June 2003, Alstom introduced the railway application of its radio technology on the Singapore North East Line. CBTC has its origins in the loop-based systems developed by Alcatel SEL (now Thales) for the Bombardier Automated Rapid Transit (ART) systems in Canada during the mid-1980s.

These systems, which were also referred to as transmission-based train control (TBTC), made use of inductive loop transmission techniques for track to train communication, introducing an alternative to track circuit based communication. This technology, operating in the 30–60 kHz frequency range to communicate trains and wayside equipment, was widely adopted by the metro operators in spite of some electromagnetic compatibility (EMC) issues, as well as other installation and maintenance concerns (see SelTrac for further information regarding transmission-based train-control).

As with new application of any technology, some problems arose at the beginning mainly due to compatibility and interoperability aspects.[10][11] However, there have been relevant improvements since then, and currently the reliability of the radio-based communication systems has grown significantly.

Moreover, it is important to highlight that not all the systems using radio communication technology are considered to be CBTC systems. So, for clarity and to keep in line with the state-of-the-art solutions for operator's requirements,[11] this article only covers the latest moving block principle based (either true moving block or virtual block, so not dependent on track-based detection of the trains)[1] CBTC solutions that make use of the radio communications.

Main features

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CBTC and moving block

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CBTC systems are modern railway signaling systems that can mainly be used in urban railway lines (either light or heavy) and APMs, although it could also be deployed on commuter lines. For main lines, a similar system might be the European Railway Traffic Management System ERTMS Level 3 (not yet fully defined [when?]). In the modern CBTC systems the trains continuously calculate and communicate their status via radio to the wayside equipment distributed along the line. This status includes, among other parameters, the exact position, speed, travel direction and braking distance.

This information allows calculation of the area potentially occupied by the train on the track. It also enables the wayside equipment to define the points on the line that must never be passed by the other trains on the same track. These points are communicated to make the trains automatically and continuously adjust their speed while maintaining the safety and comfort (jerk) requirements. So, the trains continuously receive information regarding the distance to the preceding train and are then able to adjust their safety distance accordingly.

 
The safety distance (safe-braking distance) between trains in fixed block and moving block signalling systems

From the signalling system perspective, the first figure shows the total occupancy of the leading train by including the whole blocks which the train is located on. This is due to the fact that it is impossible for the system to know exactly where the train actually is within these blocks. Therefore, the fixed block system only allows the following train to move up to the last unoccupied block's border.

In a moving block system as shown in the second figure, the train position and its braking curve is continuously calculated by the trains, and then communicated via radio to the wayside equipment. Thus, the wayside equipment is able to establish protected areas, each one called Limit of Movement Authority (LMA), up to the nearest obstacle (in the figure the tail of the train in front). Movement Authority (MA) is the permission for a train to move to a specific location within the constraints of the infrastructure and with supervision of speed.[12]

End of Authority is the location to which the train is permitted to proceed and where target speed is equal to zero. End of Movement is the location to which the train is permitted to proceed according to an MA. When transmitting an MA, it is the end of the last section given in the MA.[12]

It is important to mention that the occupancy calculated in these systems must include a safety margin for location uncertainty (in yellow in the figure) added to the length of the train. Both of them form what is usually called 'Footprint'. This safety margin depends on the accuracy of the odometry system in the train.

CBTC systems based on moving block allows the reduction of the safety distance between two consecutive trains. This distance is varying according to the continuous updates of the train location and speed, maintaining the safety requirements. This results in a reduced headway between consecutive trains and an increased transport capacity.

Grades of automation

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Modern CBTC systems allow different levels of automation or grades of automation (GoA), as defined and classified in the IEC 62290–1.[13] In fact, CBTC is not a synonym for "driverless" or "automated trains" although it is considered as a basic enabler technology for this purpose.

There are four grades of automation available:

  • GoA 0 - On-sight, with no automation
  • GoA 1 - Manual, with a driver controlling all train operations.
  • GoA 2 - Semi-automatic Operation (STO), starting and stopping are automated, but a driver who sits in the cab operates the doors and drives in emergencies
  • GoA 3 - Driverless Train Operation (DTO), starting and stopping are automated, but a crew member operates the doors from within the train
  • GoA 4 - Unattended Train Operation (UTO), starting, stopping and doors are all automated, with no required crew member on board

Main applications

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CBTC systems allow optimal use of the railway infrastructure as well as achieving maximum capacity and minimum headway between operating trains, while maintaining the safety requirements. These systems are suitable for the new highly demanding urban lines, but also to be overlaid on existing lines in order to improve their performance.[5]

Of course, in the case of upgrading existing lines the design, installation, test and commissioning stages are much more critical. This is mainly due to the challenge of deploying the overlying system without disrupting the revenue service.[14]

Main benefits

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The evolution of the technology and the experience gained in operation over the last 30 years means that modern CBTC systems are more reliable and less prone to failure than older train control systems. CBTC systems normally have less wayside equipment and their diagnostic and monitoring tools have been improved, which makes them easier to implement and, more importantly, easier to maintain.[15]

CBTC technology is evolving, making use of the latest techniques and components to offer more compact systems and simpler architectures. For instance, with the advent of modern electronics it has been possible to build in redundancy so that single failures do not adversely impact operational availability.

Moreover, these systems offer complete flexibility in terms of operational schedules or timetables, enabling urban rail operators to respond to the specific traffic demand more swiftly and efficiently and to solve traffic congestion problems. In fact, automatic operation systems have the potential to significantly reduce the headway and improve the traffic capacity compared to manual driving systems.[16][17]

Finally, it is important to mention that the CBTC systems have proven to be more energy efficient than traditional manually driven systems.[15] The use of new functionalities, such as automatic driving strategies or a better adaptation of the transport offer to the actual demand, allows significant energy savings reducing the power consumption.

Risks

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The primary risk of an electronic train control system is that if the communications link between any of the trains is disrupted then all or part of the system might have to enter a failsafe state until the problem is remedied. Depending on the severity of the communication loss, this state can range from vehicles temporarily reducing speed, coming to a halt or operating in a degraded mode until communications are re-established. If communication outage is permanent some sort of contingency operation must be implemented which may consist of manual operation using absolute block or, in the worst case, the substitution of an alternative form of transportation.[18]

As a result, high availability of CBTC systems is crucial for proper operation, especially if such systems are used to increase transport capacity and reduce headway. System redundancy and recovery mechanisms must then be thoroughly checked to achieve a high robustness in operation. With the increased availability of the CBTC system, there is also a need for extensive training and periodical refresh of system operators on the recovery procedures. In fact, one of the major system hazards in CBTC systems is the probability of human error and improper application of recovery procedures if the system becomes unavailable.

Communications failures can result from equipment malfunction, electromagnetic interference, weak signal strength or saturation of the communications medium.[19] In this case, an interruption can result in a service brake or emergency brake application as real time situational awareness is a critical safety requirement for CBTC and if these interruptions are frequent enough it could seriously impact service. This is the reason why, historically, CBTC systems first implemented radio communication systems in 2003, when the required technology was mature enough for critical applications.

In systems with poor line of sight or spectrum/bandwidth limitations a larger than anticipated number of transponders may be required to enhance the service. This is usually more of an issue with applying CBTC to existing transit systems in tunnels that were not designed from the outset to support it. An alternate method to improve system availability in tunnels is the use of leaky feeder cable that, while having higher initial costs (material + installation) achieves a more reliable radio link.

With the emerging services over open ISM radio bands (i.e. 2.4 GHz and 5.8 GHz) and the potential disruption over critical CBTC services, there is an increasing pressure in the international community (ref. report 676 of UITP organization, Reservation of a Frequency Spectrum for Critical Safety Applications dedicated to Urban Rail Systems) to reserve a frequency band specifically for radio-based urban rail systems. Such decision would help standardize CBTC systems across the market (a growing demand from most operators) and ensure availability for those critical systems.

As a CBTC system is required to have high availability and particularly, allow for a graceful degradation, a secondary method of signaling might be provided to ensure some level of non-degraded service upon partial or complete CBTC unavailability.[20] This is particularly relevant for brownfield implementations (lines with an already existing signalling system) where the infrastructure design cannot be controlled and coexistence with legacy systems is required, at least, temporarily.[21]

For example, the BMT Canarsie Line in New York City was outfitted with a backup automatic block signaling system capable of supporting 12 trains per hour (tph), compared with the 26 tph of the CBTC system. Although this is a rather common architecture for resignalling projects, it can negate some of the cost savings of CBTC if applied to new lines. This is still a key point in the CBTC development (and is still being discussed), since some providers and operators argue that a fully redundant architecture of the CBTC system may however achieve high availability values by itself.[21]

In principle, CBTC systems may be designed with centralized supervision systems in order to improve maintainability and reduce installation costs. If so, there is an increased risk of a single point of failure that could disrupt service over an entire system or line. Fixed block systems usually work with distributed logic that are normally more resistant to such outages. Therefore, a careful analysis of the benefits and risks of a given CBTC architecture (centralized vs. distributed) must be done during system design.

When CBTC is applied to systems that previously ran under complete human control with operators working on sight it may actually result in a reduction in capacity (albeit with an increase in safety). This is because CBTC operates with less positional certainty than human sight and also with greater margins for error as worst-case train parameters are applied for the design (e.g. guaranteed emergency brake rate vs. nominal brake rate). For instance, CBTC introduction in Philly's Center City trolley tunnel resulted initially in a marked increase in travel time and corresponding decrease in capacity when compared with the unprotected manual driving. This was the offset to finally eradicate vehicle collisions which on-sight driving cannot avoid and showcases the usual conflicts between operation and safety.

Architecture

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The architecture of a CBTC system

The typical architecture of a modern CBTC system comprises the following main subsystems:

  1. Wayside equipment, which includes the interlocking and the subsystems controlling every zone in the line or network (typically containing the wayside ATP and ATO functionalities). Depending on the suppliers, the architectures may be centralized or distributed. The control of the system is performed from a central command ATS, though local control subsystems may be also included as a fallback.
  2. CBTC onboard equipment, including ATP and ATO subsystems in the vehicles.
  3. Train to wayside communication subsystem, currently based on radio links.

Thus, although a CBTC architecture is always depending on the supplier and its technical approach, the following logical components may be found generally in a typical CBTC architecture:

  • Onboard ATP system. This subsystem is in charge of the continuous control of the train speed according to the safety profile, and applying the brake if it is necessary. It is also in charge of the communication with the wayside ATP subsystem in order to exchange the information needed for a safe operation (sending speed and braking distance, and receiving the limit of movement authority for a safe operation).
  • Onboard ATO system. It is responsible for the automatic control of the traction and braking effort in order to keep the train under the threshold established by the ATP subsystem. Its main task is either to facilitate the driver or attendant functions, or even to operate the train in a fully automatic mode while maintaining the traffic regulation targets and passenger comfort. It also allows the selection of different automatic driving strategies to adapt the runtime or even reduce the power consumption.
  • Wayside ATP system. This subsystem undertakes the management of all the communications with the trains in its area. Additionally, it calculates the limits of movement authority that every train must respect while operating in the mentioned area. This task is therefore critical for the operation safety.
  • Wayside ATO system. It is in charge of controlling the destination and regulation targets of every train. The wayside ATO functionality provides all the trains in the system with their destination as well as with other data such as the dwell time in the stations. Additionally, it may also perform auxiliary and non-safety related tasks including for instance alarm/event communication and management, or handling skip/hold station commands.
  • Communication system. The CBTC systems integrate a digital networked radio system by means of antennas or leaky feeder cable for the bi-directional communication between the track equipment and the trains. The 2,4GHz band is commonly used in these systems (same as WiFi), though other alternative frequencies such as 900 MHz (US), 5.8 GHz or other licensed bands may be used as well.
  • ATS system. The ATS system is commonly integrated within most of the CBTC solutions. Its main task is to act as the interface between the operator and the system, managing the traffic according to the specific regulation criteria. Other tasks may include the event and alarm management as well as acting as the interface with external systems.
  • Interlocking system. When needed as an independent subsystem (for instance as a fallback system), it will be in charge of the vital control of the trackside objects such as switches or signals, as well as other related functionality. In the case of simpler networks or lines, the functionality of the interlocking may be integrated into the wayside ATP system.

Projects

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CBTC technology has been (and is being) successfully implemented for a variety of applications as shown in the figure below (mid 2011). They range from some implementations with short track, limited numbers of vehicles and few operating modes (such as the airport APMs in San Francisco or Washington), to complex overlays on existing railway networks carrying more than a million passengers each day and with more than 100 trains (such as lines 1 and 6 in Madrid Metro, line 3 in Shenzhen Metro, some lines in Paris Metro, New York City Subway and Beijing Subway, or the Sub-Surface network in London Underground).[4]

 
Radio-based CBTC moving block projects around the world. Projects are classified with colours depending on the supplier; those underlined are already into CBTC operation.[note 1]


Despite the difficulty, the table below tries to summarize and reference the main radio-based CBTC systems deployed around the world as well as those ongoing projects being developed. Besides, the table distinguishes between the implementations performed over existing and operative systems (brownfield) and those undertaken on completely new lines (Greenfield).

List

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This list is sortable, and is initially sorted by year. Click on the   icon on the right side of the column header to change sort key and sort order.

Location/system Lines Supplier Solution Commissioning km No. of trains Type of field Grade of automation Notes
Toronto Subway 3
Thales
SelTrac
1985
6.4
7
Greenfield UTO With train attendants who monitor door status, and drive trains in the event of a disruption.
SkyTrain (Vancouver) Expo Line, Millennium Line, Canada Line
Thales
SelTrac
1986
85.4
20
Greenfield UTO
Detroit Detroit People Mover
Thales
SelTrac
1987
4.7
12
Greenfield UTO
London Docklands Light Railway
Thales
SelTrac
1987
38
149
Greenfield DTO With train attendants (T\train captains) who drive trains in the event of a disruption.
San Francisco Airport AirTrain
Bombardier
CITYFLO 650
2003
5
38
Greenfield UTO
Seattle-Tacoma Airport Satellite Transit System
Bombardier
CITYFLO 650
2003
3
22
Brownfield UTO
Singapore MRT North East Line
Alstom
Urbalis 300
2003
20
43
Greenfield UTO With train attendants (train captains) who drive trains in the event of a disruption.
Hong Kong MTR Tuen Ma line
Thales
SelTrac 2020 (Tuen Ma Line Phase 1)

2021 (Tuen Ma Line and former West Rail Line)

57
65
Greenfield (Tai Wai to Hung Hom section only)

Brownfield (other sections)

STO Existing sections were upgraded from SelTrac IS
Las Vegas Monorail
Thales
SelTrac
2004
6
36
Greenfield UTO
Wuhan Metro 1
Thales
SelTrac
2004
27
32
Greenfield STO
Dallas–Fort Worth Airport DFW Skylink
Bombardier
CITYFLO 650
2005
10
64
Greenfield UTO
Hong Kong MTR Disneyland Resort line
Thales
SelTrac
2005
3
3
Greenfield UTO
Lausanne Metro M2
Alstom
Urbalis 300
2008
6
18
Greenfield UTO
London Heathrow Airport Heathrow APM
Bombardier
CITYFLO 650
2008
1
9
Greenfield UTO
Madrid Metro    ,  
Bombardier
CITYFLO 650
2008
48
143
Brownfield STO
McCarran Airport McCarran Airport APM
Bombardier
CITYFLO 650
2008
2
10
Brownfield UTO
Bangkok BTS Skytrain Silom Line, Sukhumvit Line
Bombardier
CITYFLO 450[22]
2009 (Mo Chit - On Nut & National Stadium - Wongwian Yai sections)
2011 (On Nut extension)
2015 (Samrong extension)
2018 (Kheha extension)
2019 (Khu Khot extension)
64.26
98
Brownfield (Mo Chit to On Nut and National Stadium to Saphan Taksin sections)


Greenfield (other sections)

STO Upgraded from Siemens Trainguard LZB700M CTC in 2009.
Bangkok BTS Skytrain Gold Line
Bombardier
CITYFLO 650
2020
1.7
3
Greenfield UTO
Bangkok MRT Purple Line
Bombardier
CITYFLO 650
2015
23
21
Greenfield STO With train attendants who drive trains in the event of a disruption. These train attendants are on standby in the train.
Bangkok MRT Pink, Yellow
Bombardier
CITYFLO 650
2021
62.52
58
Greenfield UTO
Barcelona Metro    ,  
Siemens
Trainguard MT CBTC
2009
46
50
Greenfield UTO
Beijing Subway 4
Thales
SelTrac
2009
29
40
Greenfield STO
New York City Subway BMT Canarsie Line, IRT Flushing Line
Siemens
Trainguard MT CBTC
2009
17
69[note 2] Brownfield STO
Shanghai Metro 6, 7, 8, 9, 11
Thales
SelTrac
2009
238
267
Greenfield and Brownfield STO
Singapore MRT Circle Line
Alstom
Urbalis 300
2009
35
64
Greenfield UTO With train attendants (Rovers) who drive trains in the event of a disruption. These train attendants are also on standby between Botanic Gardens and Caldecott stations.
Taipei Metro Neihu-Mucha
Bombardier
CITYFLO 650
2009
26
76
Greenfield and Brownfield UTO
Washington-Dulles Airport Dulles APM
Thales
SelTrac
2009
8
29
Greenfield UTO
Beijing Subway Daxing Line
Thales
SelTrac
2010
22
Greenfield STO
Beijing Subway 15
Nippon Signal
SPARCS
2010
41.4
28
Greenfield ATO
Guangzhou Metro Zhujiang New Town APM
Bombardier
CITYFLO 650
2010
4
19
Greenfield DTO
Guangzhou Metro 3
Thales
SelTrac
2010
67
40
Greenfield DTO
São Paulo Metro 1, 2, 3
Alstom
Urbalis
2010
62
142
Greenfield and Brownfield UTO CBTC operates in Lines 1 and 2 and it is being installed in Line 3
São Paulo Metro 4
Siemens
Trainguard MT CBTC
2010
13
29
Greenfield UTO First UTO line in Latin America
London Underground Jubilee line
Thales
SelTrac
2010
37
63
Brownfield STO
London Gatwick Airport Shuttle Transit APM
Bombardier
CITYFLO 650
2010
1
6
Brownfield UTO
Milan Metro 1
Alstom
Urbalis
2010
27
68
Brownfield STO
Philadelphia SEPTA SEPTA subway–surface trolley lines
Bombardier
CITYFLO 650
2010
8
115
STO
Shenyang Metro 1
Ansaldo STS
CBTC
2010
27
23
Greenfield STO
B&G Metro Busan-Gimhae Light Rail Transit
Thales
SelTrac
2011
23.5
25
Greenfield UTO
Dubai Metro Red, Green
Thales
SelTrac
2011
70
85
Greenfield UTO
Madrid Metro     Extension MetroEste
Invensys
Sirius
2011
9
? Brownfield STO
Paris Métro 1
Siemens
Trainguard MT CBTC
2011
16
53
Brownfield DTO
Sacramento International Airport Sacramento APM
Bombardier
CITYFLO 650
2011
1
2
Greenfield UTO
Shenzhen Metro 3
Bombardier
CITYFLO 650
2011
42
43
STO
Shenzhen Metro 2, 5
Alstom
Urbalis 888
2010–2011
76
65
Greenfield STO
Shenyang Metro 2
Ansaldo STS
CBTC
2011
21.5
20
Greenfield STO
Xian Metro 2
Ansaldo STS
CBTC
2011
26.6
22
Greenfield STO
Yongin EverLine
Bombardier
CITYFLO 650
2011
19
30
UTO
Algiers Metro 1
Siemens
Trainguard MT CBTC
2012
9
14
Greenfield STO
Chongqing Metro 1, 6
Siemens
Trainguard MT CBTC
2011–2012
94
80
Greenfield STO
Guangzhou Metro 6
Alstom
Urbalis 888
2012
24
27
Greenfield ATO
Istanbul Metro M4
Thales
SelTrac
2012
21.7
Greenfield
M5 Bombardier CityFLO 650
Phase 1: 2017 Phase 2: 2018
16.9
21
Greenfield UTO
Ankara Metro M1 Ansaldo STS CBTC
2018
14.6
Brownfield STO
M2 Ansaldo STS CBTC
2014
16.5
Greenfield STO
M3 Ansaldo STS CBTC
2014
15.5
Greenfield STO
M4 Ansaldo STS CBTC
2017
9.2
Greenfield STO
Mexico City Metro  
Alstom
Urbalis
2012
25
30
Greenfield STO
 
Siemens
Trainguard MT CBTC
2022-2024
18
39
Brownfield DTO
New York City Subway IND Culver Line
Thales & Siemens
Various
2012
Greenfield A test track was retrofitted in 2012; the line's other tracks will be retrofitted by the early 2020s.
Phoenix Sky Harbor Airport PHX Sky Train
Bombardier
CITYFLO 650
2012
3
18
Greenfield UTO
Riyadh KAFD Monorail
Bombardier
CITYFLO 650
2012
4
12
Greenfield UTO
São Paulo Commuter Lines 8, 10, 11
Invensys
Sirius
2012
107
136
Brownfield UTO
Tianjin Metro 2, 3
Bombardier
CITYFLO 650
2012
52
40
STO
Beijing Subway 8, 10
Siemens
Trainguard MT CBTC
2013
84
150
STO
Caracas Metro 1
Invensys
Sirius
2013
21
48
Brownfield
Kunming Metro 1, 2
Alstom
Urbalis 888
2013
42
38
Greenfield ATO
Málaga Metro    ,  
Alstom
Urbalis
2013
17
15
Greenfield ATO
Paris Métro 3, 5 Ansaldo STS / Siemens Inside RATP's
Ouragan project
2010, 2013
26
40
Brownfield STO
Paris Métro 13
Thales
SelTrac
2013
23
66
Brownfield STO
Toronto subway 1
Alstom
Urbalis 400
2017 to 2022
76.78[6] 65[6] Brownfield (Finch to Sheppard West)
Greenfield (Sheppard West to Vaughan)
STO CBTC active between Vaughan Metropolitan Centre and Eglinton stations as of October 2021.[23] The entire line is scheduled to be fully upgraded by 2022.[24][7]
Wuhan Metro 2, 4
Alstom
Urbalis 888
2013
60
45
Greenfield STO
Singapore MRT Downtown Line
Invensys
Sirius
2013
42
92
Greenfield UTO With train attendants who drive trains in the event of a disruption.
Budapest Metro M2, M4
Siemens
Trainguard MT CBTC 2013 (M2)
2014 (M4)
17
41
Line M2: STO

Line M4: UTO

Dubai Metro Al Sufouh LRT
Alstom
Urbalis
2014
10
11
Greenfield STO
Edmonton LRT Capital Line, Metro Line
Thales
SelTrac
2014
24 double track
94
Brownfield DTO
Helsinki Metro 1
Siemens
Trainguard MT CBTC
2014
35
45.5
Greenfield and Brownfield STO[25]
Hong Kong MTR Hong Kong APM
Thales
SelTrac
2014
4
14
Brownfield UTO
Incheon Subway 2
Thales
SelTrac
2014
29
37
Greenfield UTO
Jeddah Airport King Abdulaziz APM
Bombardier
CITYFLO 650
2014
2
6
Greenfield UTO
London Underground Northern line
Thales
SelTrac
2014
58
106
Brownfield STO
Salvador Metro 4 Thales[3] SelTrac
2014
33
29
Greenfield DTO
Massachusetts Bay Transportation Authority Ashmont–Mattapan High Speed Line
Argenia
SafeNet CBTC
2014
6
12
Greenfield STO
Munich Airport Munich Airport T2 APM
Bombardier
CITYFLO 650
2014
1
12
Greenfield UTO
Nanjing Metro Nanjing Airport Rail Link
Thales
SelTrac
2014
36
15
Greenfield STO
Shinbundang Line Dx Line
Thales
SelTrac
2014
30.5
12
Greenfield UTO
Ningbo Metro 1
Alstom
Urbalis 888
2014
21
22
Greenfield ATO
Panama Metro 1
Alstom
Urbalis
2014
13.7
17
Greenfield ATO
São Paulo Metro 15
Bombardier
CITYFLO 650
2014
14
27
Greenfield UTO
Shenzhen Metro 9
Thales Saic Transport
SelTrac
2014
25.38
Greenfield
Xian Metro 1
Siemens
Trainguard MT CBTC
2013–2014
25.4
80
Greenfield STO
Amsterdam Metro 50, 51, 52, 53, 54
Alstom
Urbalis
2015
62
85
Greenfield and Brownfield STO
Beijing Subway 1, 2, 6, 9, Fangshan Line, Airport Express
Alstom
Urbalis 888
From 2008 to 2015
159
240
Brownfield and Greenfield STO and DTO
Chengdu Metro L4, L7
Alstom
Urbalis
2015
22.4
Greenfield ATO
Delhi Metro Line 7, Line 9
Bombardier
CITYFLO 650
2018 (Temp. Driver on Board) 2021 (Full ATO Operations) 2024 (transitioning to UTO)
55
Nanjing Metro 2, 3, 10, 12
Siemens
Trainguard MT CBTC
From 2010 to 2015
137
140
Greenfield
São Paulo Metro 5
Bombardier
CITYFLO 650
2015
20
34
Brownfield & Greenfield UTO
Shanghai Metro 10, 12, 13, 16
Alstom
Urbalis 888
From 2010 to 2015
120
152
Greenfield UTO and STO
Taipei Metro Circular
Ansaldo STS
CBTC
2015
15
17
Greenfield UTO
Wuxi Metro 1, 2
Alstom
Urbalis
2015
58
46
Greenfield STO
Philadelphia SEPTA Media–Sharon Hill Line
Ansaldo STS
CBTC
2015
19.2
29
STO
Buenos Aires Underground  
Siemens
Trainguard MT CBTC
2016
8
20
? ?
Buenos Aires Underground  
Siemens
Trainguard MT CBTC
2016
4.5
18
TBD TBD
Hong Kong MTR South Island line
Alstom
Urbalis 400
2016
7
10
Greenfield UTO
Hyderabad Metro Rail L1, L2, L3
Thales
SelTrac
2016
72
57
Greenfield STO
Kochi Metro L1
Alstom
Urbalis 400
2016
26
25
Greenfield ATO
New York City Subway IRT Flushing Line
Thales
SelTrac
2016
17
46[note 3] Brownfield and Greenfield STO
Kuala Lumpur Metro (LRT) Line 3 & 4, Ampang and Sri Petaling lines

Line 5, Kelana Jaya Line

Thales
SelTrac
2016
91.5
126
Brownfield UTO
Metro Santiago  
Alstom
Urbalis
2016
20
42
Greenfield and Brownfield DTO
Walt Disney World Walt Disney World Monorail System
Thales
SelTrac
2016
22
15
Brownfield UTO
Fuzhou Metro 1
Siemens
Trainguard MT CBTC
2016
24
28
Greenfield STO
Kuala Lumpur Metro (MRT) Line 9, Kajang Line

Line 12, Putrajaya Line

Bombardier
CITYFLO 650
2017 (Kajang Line)
2021 (Putrajaya Line)
103.7
107
Greenfield UTO
Delhi Metro Line-8 Nippon Signal SPARCS 2017 (Temp. Driver on Board) 2021 (Full ATO Operations) Greenfield UTO
Lille Metro 1
Alstom
Urbalis
2017
15
27
Brownfield UTO
Lucknow Metro L1
Alstom
Urbalis
2017
23
20
Greenfield ATO
New York City Subway IND Queens Boulevard Line Siemens/Thales Trainguard MT CBTC
2017–2022
[note 4]
21.9
[note 5]
309[note 6] Brownfield ATO Train conductors will be located aboard the train because other parts of the routes using the Queens Boulevard Line will not be equipped with CBTC.
Metro Santiago  
Thales
SelTrac
2017
15.4
15
Greenfield UTO
Stockholm Metro Red line
Ansaldo STS
CBTC
2017
41
30
Brownfield STO->UTO
Taichung Metro Green
Alstom
Urbalis
2017
18
29
Greenfield UTO
Singapore MRT North–South Line
Thales
SelTrac
2017
45.3
198
Brownfield UTO[26] With train attendants (train captains) who drive trains in the event of a disruption. These train attendants are on standby in the train.
Singapore MRT East–West Line
Thales
SelTrac
2018
57.2
198
Brownfield (original line)
Greenfield
(Tuas West Extension only)
UTO[26] With train attendants who drive trains in the event of a disruption. These train attendants are on standby in the train.
Copenhagen S-Train All lines
Siemens
Trainguard MT CBTC
2021
170
136
Brownfield STO
Doha Metro L1
Thales
SelTrac
2018
33
35
Greenfield ATO
New York City Subway IND Eighth Avenue Line Siemens/Thales Trainguard MT CBTC
2018–2024
[note 7]
9.3
Brownfield ATO Train conductors will be located aboard the train because other parts of the routes using the Eighth Avenue Line will not be equipped with CBTC.
Ottawa Light Rail Confederation Line
Thales
SelTrac
2018
12.5
34
Greenfield STO
Port Authority Trans-Hudson (PATH) All lines
Siemens
Trainguard MT CBTC
2018
22.2
50
Brownfield ATO
Rennes ART B
Siemens
Trainguard MT CBTC
2018
12
19
Greenfield UTO
Riyadh Metro L4, L5 and L6
Alstom
Urbalis
2018
64
69
Greenfield ATO
Sosawonsi Co. (Gyeonggi-do) Seohae Line
Siemens
Trainguard MT CBTC
2018
23.3
7
Greenfield
ATO
Buenos Aires Underground  
TBD
TBD
2019
11
26
TBD TBD
Fuzhou Metro 2
Siemens
Trainguard MT CBTC
2019
30
31
greenfield STO
Gimpo Gimpo Goldline
Nippon Signal
SPARCS
2019
23.63
23
Greenfield UTO
Jakarta MRT North–south line
Nippon Signal
SPARCS
2019
20.1
16
Greenfield STO
Panama Metro 2
Alstom
Urbalis
2019
21
21
Greenfield ATO
Metro Santiago  
Thales
SelTrac
2019
21.7
22
Greenfield UTO
Sydney Metro Metro North West & Bankstown Line
Alstom
Urbalis 400
2019
37
22
Brownfield UTO
Singapore MRT Thomson–East Coast Line
Alstom
Urbalis 400
2020
43
91
Greenfield UTO
Suvarnabhumi Airport APM MNTB to SAT-1
Siemens
Trainguard MT CBTC
2020
1
6
Greenfield UTO
Fuzhou Metro Line 1 Extension
Siemens
Trainguard MT CBTC
2020
29
28
Brownfield STO
Bucharest Metro Line M5 Alstom Urbalis 400
2020
6.9
13
STO To be fully operational after the delivery of the 13 Alstom Metropolis BM4 trains.
Bay Area Rapid Transit Red Line, Orange Line, Yellow Line, Green Line, Blue Line
Hitachi Rail STS
CBTC
2030
211.5
Brownfield STO
Lahore Orange Line Alstom-Casco Urabliss888
2020
27
27 (CRRC)
Greenfield ATO
Hong Kong MTR East Rail line
Siemens
Trainguard MT CBTC
2021
41.5
37
Brownfield STO
Lisbon Metro Blue Line, Yellow Line, Green Line[27]
Siemens
Trainguard MT CBTC
2021-2027
33.7
84
Brownfield STO
London Underground Metropolitan, District, Circle, Hammersmith & City
Thales
SelTrac
2021 to 2022
310
192
Brownfield STO
Baselland Transport (BLT) Line 19 Waldenburgerbahn
Stadler
CBTC
2022
13.2
10
Greenfield STO
São Paulo Metro 17
Thales
SelTrac
2022
17.7
24
Greenfield UTO Under construction
Melbourne Cranbourne line, Pakenham line, Sunbury line, Metro Tunnel
Bombardier
CITYFLO 650
2023
115.8
70
Brownfield STO CBTC only available between West Footscray and Clayton stations
São Paulo Metro Line 6
Nippon Signal
SPARCS
2023
15
24
Greenfield UTO Under construction
Tokyo Tokyo Metro Marunouchi Line[28]
Mitsubishi
? 2023
27.4
53
Brownfield ?
Tokyo Tokyo Metro Hibiya Line ? ?
2023
20.3
42
Brownfield ?
Seoul Sillim Line LTran-CX
2023
7.8
?
?
?
JR West Wakayama Line ? ?
2023
42.5
? Brownfield ?
Kuala Lumpur Metro (LRT) Line 11, Shah Alam Line
Thales
SelTrac
2024
36
25
Brownfield UTO
Guangzhou Metro Line 4, Line 5
Siemens
Trainguard MT CBTC ?
70
?
Guangzhou Metro Line 9
Thales
SelTrac
2017
20.1
11
Greenfield DTO
Marmaray Lines Commuter Lines
Invensys
Sirius ?
77
? Greenfield STO
Tokyo Jōban Line[29]
Thales
SelTrac
2017
30
70
Brownfield STO The plan was abandoned because of its technical and cost problems;[30] the control system was replaced by ATACS.[30]
Hong Kong MTR Kwun Tong line, Tsuen Wan line, Island line, Tseung Kwan O line
Alstom-Thales
Advanced SelTrac 2025-2029
58.1
128
Brownfield STO & DTO
New York City Subway IND Crosstown Line[31]
Thales
SelTrac
2029
16
309[note 6] Brownfield STO
Porto Metro  [32]
Alstom
Cityflo 250
2024
3.0
18
Greenfield STO
Ahmedabad MEGA Nippon Signal SPARCS ?
39.259
96 coaches(Rolling Stock)
? ?

Notes and references

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Notes

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  1. ^ Only radio-based projects using the moving block principle are shown.
  2. ^ This is the number of four-car train sets available. The BMT Canarsie Line runs trains with eight cars.
  3. ^ This is the number of eleven-car train sets available. The IRT Flushing Line runs trains with eleven cars, though they are not all linked together; they are arranged in five- and six-car sets.
  4. ^ Work being done in phases; the main phase between 50th Street and Kew Gardens–Union Turnpike stations was completed in 2022
  5. ^ Includes a 1.48 km "express bypass" where non-stopping express trains take a different route than stopping local trains.
  6. ^ a b This is the number of four- and five- car sets to be equipped with CBTC; they will be linked up in sets of 8 or 10 cars each. The routes that use the Queens Boulevard and Crosstown lines are serviced by trains from Jamaica Yard and East New York Yard.
  7. ^ Work being done in phases; the first phase is between 59th and High Street stations.

References

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  1. ^ a b c d e 1474.1–1999 – IEEE Standard for Communications-Based Train Control (CBTC) Performance and Functional Requirements.[1] (Accessed at January 14, 2019).
  2. ^ Wu, Qing; Ge, Xiahau; Cole, Colin; Spiryagin, Maksym; Bernal Arango, Esteban (2023-01-01). Communication based train control (CBTC): Train controller and dynamics. CQUniversity. ISBN 978-1-925627-79-4.
  3. ^ a b "Thales awarded signalling contract for new Salvador metro". Thales Group. 2014-03-24. Retrieved 2019-05-09.
  4. ^ a b Bombardier to Deliver Major London Underground Signalling.[2] Press release, Bombardier Transportation Media Center, 2011. Accessed June 2011
  5. ^ a b CITYFLO 650 Metro de Madrid, Solving the capacity challenge.[3] Archived 2012-03-30 at the Wayback Machine Bombardier Transportation Rail Control Solutions, 2010. Accessed June 2011
  6. ^ a b c "Service Summary" (PDF). Toronto Transit Commission.
  7. ^ a b "Modernizing the signal system: 2017 subway closures". Toronto Transit Commission. January 18, 2017. Retrieved January 23, 2017. [video position 1:56]Trains will be able to operate as frequently as every 1 minute and 55 seconds instead of the current limit of two and a half minutes. [2:19]When installation is completed along the entire line in 2019, it will allow for as much as 25% more capacity. [2:33]ATC will come online on all of Line 1 in phases by the end of 2019 starting with the portion of Line 1 between Spadina and Wilson stations and with the Line 1 extension into York Region that opens at the end of this year.
  8. ^ Digital radio shows great potential for Rail [4] Bruno Gillaumin, International Railway Journal, May 2001. Retrieved by findarticles.com in June 2011.
  9. ^ "Bombardier Marks 15th Anniversary of Its World-First Radio-Based, Driverless Rail Control System" (Press release). Bombardier Transportation. MarketWired. March 29, 2018. Archived from the original on January 22, 2019. Retrieved January 22, 2019.
  10. ^ CBTC Projects. [5] Archived 2015-06-14 at the Wayback Machine www.tsd.org/cbtc/projects, 2005. Accessed June 2011.
  11. ^ a b CBTC radios: What to do? Which way to go? [6] Archived 2011-07-28 at the Wayback Machine Tom Sullivan, 2005. www.tsd.org. Accessed May 2011.
  12. ^ a b Subset-023. "ERTMS/ETCS-Glossary of Terms and Abbreviations". ERTMS USERS GROUP. 2014. Archived from the original on 2018-12-21. Retrieved 2018-12-21.
  13. ^ IEC 62290-1, Railway applications – Urban guided transport management and command/control systems – Part 1: System principles and fundamental concepts.[7] IEC, 2006. Accessed February 2014
  14. ^ Madrid's silent revolution.[8] in International Railway Journal, Keith Barrow, 2010. Accessed through goliath.ecnext.com in June 2011
  15. ^ a b Semi-automatic, driverless, and unattended operation of trains.[9] Archived 2010-11-19 at the Wayback Machine IRSE-ITC, 2010. Accessed through www.irse-itc.net in June 2011
  16. ^ CBTC: más trenes en hora punta.[10][permanent dead link] Comunidad de Madrid, www.madrig.org, 2010. Accessed June 2011
  17. ^ How CBTC can Increase capacity – communications-based train control. [11] William J. Moore, Railway Age, 2001. Accessed through findarticles.com in June 2011
  18. ^ ETRMS Level 3 Risks and Benefits to UK Railways, pg 19 [12] Transport Research Laboratory. Accessed December 2011
  19. ^ ETRMS Level 3 Risks and Benefits to UK Railways, Table 5 [13] Transport Research Laboratory. Accessed December 2011
  20. ^ ETRMS Level 3 Risks and Benefits to UK Railways, pg 18 [14] Transport Research Laboratory. Accessed December 2011
  21. ^ a b CBTC World Congress Presentations, Stockholm, November 2011 [15] Global Transport Forum. Accessed December 2011
  22. ^ "Mass transit signalling". web.archive.org. 2022-01-01. Retrieved 2024-11-26.
  23. ^ Stuart Green [@TTCStuart] (2021-10-02). "This weekend's scheduled #TTC subway closure is now over and full service has resumed. Crews have completed the work on this phase of the new Automatic Train Control signaling system on Line 1. ATC now operating Vaughan MC to Eglinton" (Tweet) – via Twitter.
  24. ^ Fox, Chris (2019-04-05). "New signal system is three years behind schedule and $98M over budget: report". CP24. Retrieved 2019-04-10.
  25. ^ Helsinki Metro automation ambitions are scaled back. Urban Rail News Railway Gazette International 2012
  26. ^ a b Cheng, Kenneth (2017-04-12). "Full-day signalling tests on North-South Line to start on Sunday". TODAY Online. Retrieved 2022-05-22.
  27. ^ "Siemens Mobility and Stadler consortium wins contract to modernize and upgrade the Lisbon Metro" (Press release). Siemens Mobility. May 10, 2021. Archived from the original on September 25, 2024. Retrieved September 25, 2024.
  28. ^ 三菱電機、東京メトロ丸ノ内線に列車制御システム向け無線装置を納入 (in Japanese), Mynavi Corporation, February 22, 2018
  29. ^ Briginshaw, David (January 8, 2014). "JR East selects Thales to design first Japanese CBTC". hollandco.com. Holland. Retrieved January 9, 2014.
  30. ^ a b 首都圏のICT列車制御、JR東が海外方式導入を断念-国産「ΑTΑCS」推進 (in Japanese). Nikkan Kogyo Shimbun. Retrieved 12 January 2018.
  31. ^ Artymiuk, Simon (March 7, 2023). "MTA awards Crosstown Line CBTC contract to Thales and TCE". International Railway Journal. Retrieved August 4, 2024.
  32. ^ "Alstom's leading urban signalling technology selected to enhance passenger connectivity on the Metro do Porto Pink Line in Portugal" (Press release). Alstom. March 12, 2024. Archived from the original on May 24, 2024. Retrieved September 25, 2024.

Further reading

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