In those days, Hitchcock was pretty exacting about routes and terrain -- he would have an assistant "drive the route." For North by Northwest, Hitchcock had the film's screenwriter Ernest Lehman ride the 20th Century Limited, start to finish.
I'm willing to be that Hitchcock got permission to put cameras pointing out of various windows to get process plate footage of the train ride.
Note in passing: Hitchcock said that he wanted in these scenes to create the impression that "you are on the train, moving with the train" particular those shots where the camera is right on the side of the train and then dissolves into the train.
Hitch said: " I wanted the audience to feel that they were on the train. If I put the camera out in a field looking at it in the distance, that would be the point of view of a cow."
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