Redneck Parrotheads:How's about a category that includes all railroad parts on display?
I found these things not too long ago:

I believe the category will only be for MOW related equipment, that which actually maintained the rails. Signals and what you have there (still not sure what) were stationary. Perhaps a separate railroad operations category could be created for these. Signals, baggage carts, scales etc. Objects used in the daily service of the railroad.
If you were interested in getting a separate category for them, I'd be glad to help.