Reading what David said above, I agree with him. This actually also looks like the training car that's being restored at the Railroad Museum in Strasburg. There would be areas in the car that would be multiple setups for various braking and other functions.
The woman who showed me the car was also saying that someone in the museum actually worked in one of those, and lots of railroad workers tried their hardest to not be sent to one of these for remedial work, especially in the summer, since they weren't ventilated too well!
