I would take the couplers off... Under US union rules, if it has a coupler, it's locomotive and needs and engineer and a conductor. No couplers, a track car "driver".
This is an older model of a machine that was imported to the US. Plasser America is the US subsidiary of the Austrian company that makes the prototype, and is a major MOW machine producer in the US today.
I am not sure what is happening with those grabs - they look like black paint applied - not freestanding delrin parts added.
I am really inclined to buy one, though it looks like it will have to be taken apart and stripped and repainted.