On one of the movie channels, MOVIES, in my area, Human Desire was playing this evening. I happened to come in for the last half hour or so. I've seen it before and don't think I caught this little discrepancy. In the last scene Glen Ford is at the controls of an Alco FA locomotive. He seems to be pulling out of a western station. Could be somewhere in California.
Broderick Crawford has just strangled Gloria Graham. The next shot is of Glen Ford at the controls. Out of his window, a bridge appears with the large letters, "Trenton Makes The World Takes". Then we have a view out of the front window. No overhead wires and fairly open landscape. A track crew moves off the track as Ford sounds his horn.
There are other mishaps earlier in the film such as Ford climbing into an Alco and getting out of a GM diesel. Although one could say that the locomotives were changed during a run.
Anyway, I get a kick out of looking for mistakes in films.