Here’re three more pix of those switchers in Polly KY:
This is looking at the back of the switcher.
These are the controls by the engineer’s chair. Note the intercom speaker.
This is the registration plate on the back switcher (the front one was gone). It’s been smoothed down over the years, but I think the model number is D904703 (that “D” could be a “O”) and the serial number is 52G155.