Greatest Train Scene in movies?

The below thread on hokey train scenes in movies got me to thinking about movies that did it RIGHT. I could come up with a few, but to me the best RR scene in ANY movie is the robbery scene in Sam Peckinpah's "THE WILD BUNCH" As Bill Holden and his band of not so merry cutthroats wait in 1913 to steal the head three cars of a munitions train, here she comes, an 1884 or so Baldwin mogul with a straight stack, an electified round case oil headlight etc. All black and filthy (and actually N de M 650). The gang gets the drop on the guards without alerting the army or the bounty hunters chasing them in the coach behind, but can't uncouple the car they need to because the slack is stretched! This is the only movie I have ever seen where they cut the air and have to "get the pin" to uncouple. Peckinpah even manages to capture the power of a steam engine on screen. Every time the throttle is widened, he cuts to the same shot of just the headlight and stack with roaring loud exhaust and just the right amount of camera shake-WONDERFUL! Peckinpah ached to direct "Emperor of the North Pole", too bad he didn't. Oh well, perhaps Scorsesse will do a RR scene some day! What is YOUR favorite RR scene?