This is, the way I see it, a VERY serious mistake by the filming crew of the movie. The Alaska Railroad, where the shooting of the movie took place, wanted all their logos and paint schemes of all the trains in the movie to be camouflaged. But yet, on the first shot of the locomotive of Eastbound 12 (yes, that is the shot of it before it mysteriously changes from ONE GP40 to TWO ALCo MRS's), you can see the blue and yellow paint scheme of the Alaska Railroad. On the DVD you might even be able to see the printed ALASKA on the side of the loco.
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