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The Saxon Class VIII 2 was a twin-coupled tender locomotive procured for passenger services by the Royal Saxon State Railways. In 1925, the Deutsche Reichsbahn grouped these engines into their Class 36.9-10.
| VIII V2 DRG Class 36.9-10 | ||||
|---|---|---|---|---|
 | ||||
| Manufacturer: | Sächsische Maschinenfabrik (Chemnitz) Schwartzkopff (Berlin) Maschinenfabrik Esslingen Linke-Hofmann (Breslau) | |||
| Numbers: | 519–538 36 901–919 |
539–568 36 921–948 |
569–636 36 951–1014 | |
| Years of manufacture: | 1896/97 | 1897–1899 | 1900–1902 | |
| Retired: | to 1931 | |||
| Quantity: | 20 | 30 | 68 | |
| Axle arrangement: | 2'B n2v | |||
| Gauge: | 1,435 mm (4 ft 8+1⁄2 in) standard gauge | |||
| Length over buffers: | 16,790 mm (55 ft 1 in) | |||
| Empty weight: | 44.7 t 44.0 long tons; 49.3 short tons |
45.5 t 44.8 long tons; 50.2 short tons |
49.0 t 48.2 long tons; 54.0 short tons | |
| Adhesive weight: | 29.1 t 28.6 long tons; 32.1 short tons |
30.2 t 29.7 long tons; 33.3 short tons |
32.0 t 31.5 long tons; 35.3 short tonst | |
| Service weight: | 49.5 t 48.7 long tons; 54.6 short tons |
51.6 t 50.8 long tons; 56.9 short tons |
54.5 t 53.6 long tons; 60.1 short tons | |
| Axle weight: | 14.5 t 14.3 long tons; 16.0 short tons |
15.1 t 14.9 long tons; 16.6 short tons |
16.0 t 15.7 long tons; 17.6 short tons | |
| Top speed: | 80 km/h (50 mph) | |||
| Indicated power: | N/K | |||
| Driving wheel diameter: | 1,590 mm (62.60 in) | |||
| Trailing wheel diameter: | 1,065 mm (41.93 in) | |||
| Valve gear: | Walschaerts | |||
| High-pressure cylinder diameter: | 440 mm (17.323 in) | 460 mm (18.110 in) | 460 mm (18.110 in) | |
| Low-pressure cylinder diameter: | 650 mm (25.591 in) | 680 mm (26.772 in) | 680 mm (26.772 in) | |
| Piston stroke: | 600 mm (23.622 in) | |||
| Boiler overpressure: | 12 bar (1,200 kPa; 170 psi) | 12 bar (1,200 kPa; 170 psi) | 13 bar (1,300 kPa; 190 psi) | |
| No. of heating tubes: | 216 | 216 | 254 | |
| Heating tube length: | 3,800 mm (150 in) | |||
| Grate area: | 1.87 m2 (20.1 sq ft) | |||
| Radiative heating area: | 13.4 m2 (144 sq ft) | 13.4 m2 (144 sq ft) | 15.6 m2 (168 sq ft) | |
| Tube heating area: | 103.1 m2 (1,110 sq ft) | 103.1 m2 (1,110 sq ft) | 121.3 m2 (1,306 sq ft) | |
| Evaporative heating area: | 112.1 m2 (1,207 sq ft) | 112.1 m2 (1,207 sq ft) | 130.77 m2 (1,407.6 sq ft) | |
| Tender: | sä 3 T 9 | sä 2'2' T 16 | sä 2'2' T 21 | |
| Brake: | Westinghouse compressed-air brake | |||
History
editThe design of the locomotives was derived from the Class VIII V1 express engines. As passenger locomotives the VIII V2 were given smaller coupled wheelsets, however. To distinguish them from the express engines, the new machines were give annotated with the subscript "2".
Between 1896 and 1902 118 locomotives were placed in service by the Royal Saxon State Railways. As well as their in-house suppliers, the Sächsische Maschinenfabrik in Chemnitz, Schwartzkopff in Berlin, Maschinenfabrik Esslingen and Linke-Hofmann in Breslau were involved in their manufacture.
During the First World War, No. 528 from the first construction series was lost. The engine was later operated by the Polish state railway PKP as No. Od101-1.
In 1920, the rest of the locomotives were transferred to the newly founded Deutsche Reichsbahn, who retired several examples in the early 1920s. For example, in 1925 the 111 remaining locomotives were given the new running numbers 36 901–919, 36 921–948 and 36 951–1014. With the increasing appearance of modern superheated locomotives like the Saxon XII H2, the XIV HT and the introduction of Prussian classes into Saxony these locomotives soon ended up carrying out secondary duties. The locomotives were all retired by 1931 and scrapped. Not a single example has survived.
Duties
editThe locomotives preferred use was in the haulage of passenger trains on the railway lines running up into the Ore Mountains. They were also used, however, on express trains. Their smaller driving wheels gave the locomotives good acceleration and their top speed of 80 km/h was sufficient for express trains in the highlands. The locomotives were mainly operated on the lines from Chemnitz to Riesa, Annaberg and Aue, from Dresden to Görlitz and Zittau and on the Dresden to Leipzig line.
In the early 1920s, they also had to haul heavy excursion trains of up to 50 axles from Dresden into Saxon Switzerland. Finally, the engines were used for commuter services around Dresden and there are even records of them being used to haul Leig trains.
Technical details
editThe boiler had a Belpaire firebox, typical of Saxon locomotives, and was located between the frame plates in the area of the firebox. The boiler was fed by two feedwater pumps made by Schäfer & Buddenberg.
The locomotive had a two-cylinder compound engine with a Walschaerts valve gear and Lindner starting system (Anfahrvorrichtung). The engine drove the first coupled axle. The front twin-axled bogie had an axle base of 2,150 mm and side play of 39 mm.
The brake was a Westinghouse compressed air brake. It acted on both sides of the coupled wheelsets. The running wheels in the bogie were unbraked.
The locomotives were coupled to tenders of Saxon Class sä 3 T 9, sä 2'2' T 16 and 2'2' T 21.
References
edit- Näbrich, Fritz; Meyer, Günter; Preuß, Reiner (1983). Lokomotivarchiv Sachsen 1 (in German). Berlin and Düsseldorf: transpress VEB Verlag für Verkehrswesen, and Alba Publikation Alf Teloeken GmbH + Co KG. ISBN 3-87094-096-4.
- Näbrich, Fritz; Preuß, Reiner; Meyer, Günter (1984). Lokomotiven sächsischer Eisenbahnen, Schnellzug- und Personenzuglokomotiven (EFA 2.1) (in German). Düsseldorf: Alba. pp. 153–158, 211–212. ISBN 3-87094-096-4.
- Preuß, Erich; Preuß, Reiner (1991). Sächsische Staatseisenbahnen (in German). Berlin: transpress Verlagsgesellschaft mbH. ISBN 3-344-70700-0.
- Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 210–212. ISBN 3-87094-081-6.