Being an avid railroad buff, I have to say that I really like this movie. There's a fantastic mix of light comedy, romantic drama, and high paced action here. Although the track splicing idea is totally rediculous in the time allowed, (and the foreman was 100% correct, the train was moving way too fast for the weld to hold), it was executed with taste and efficiency.
On the technical end, no train travelling 120 mph could survive a sudden 30 yard track switch. Here in NYC, the Metro North Commuter Railroad uses 100 yard switches that trains can only handle at about 50 mph. That train should have derailed instantly on such a sudden turn. Also, when uncoupling the cars from the locomotive, the sudden decompression of the air lines should have clamped the brakes on in the passenger coaches by locking all the wheels, and not as a slow gradual coasting as depicted.
This is one movie that really should be released on VHS/DVD. There's enough action and suspense here for any action lover. And its a family friendly movie as well.