JazzDad
Gandy Dancer
Yes, you have to listen to annoying organ music throughout the video, but you'll see the building of flat cars, casting wheels & bearings, passenger car overhaul & more. This film appears to have been made in 1954.
https://www.youtube.com/watch?v=cqTkKCpbnZU
https://www.youtube.com/watch?v=cqTkKCpbnZU