Stumbled across some GN, SP&S, NP and Milwaukee 8MM videos from the 50'.
Done by an amateur with no sound but, can't get picky, as there are few videos of GN.
Has GN Y-1's and W-1's which were the largest electrics ever made.
Also, SP&S, NP and Milwaukee plus steam.
https://www.youtube.com/watch?v=2-2eJzdrIJE
Milwaukee electrics.
https://www.youtube.com/watch?v=1pXySW5owCk
SP&S and other Northwest railroads (part 1): Lots of Z-8 4-6-6-4 footage which were the largest challengers ever made.
https://www.youtube.com/watch?v=52D1xs_hc_k
Part 2: