As I watched the movie I couldn't help but to think did they take artistic license on how switches function? They showed scenes of one train going into a siding while the unstoppable train by-passed the siding somehow. This occurred in at least two different scenes. The first scene had Denzel Washington's train go into a siding and the upstoppable train came in the opposite direction - crashing thru the last car - wouldn't this derail the oncoming train since the points would have been aligned into the siding - or would a speeding train push the points back to tangent?
The other scene had a diesel locomotive ahead of the unstoppable train and attempted to break and slow it down - the front diesel went into a siding and crashed while the unstoppable went strait - to me it would have to have gone into the siding as well.
And, don't modern locomotives automatically come to a stop if someone is not in the cab holding down a lever or something?