Probably. I'm honestly surprised nobody has, yet. You might have to do a bit of work for the hump facilities to actually do what they're supposed to, though.

RL's physics model is very basic, uncoupled wagons won't roll downhill. There is a bug that lets you put wagons into "AI drive" mode but no one's found a way to simulate humping operations in a realistic fashion.

I would think you'd just need to make freight cars that the game runs as locomotives, so you'd be able to switch on all the AI mode buttons. It'd be tedious to set up, but I'd think it'd be doable.

Getting them to start moving is easy. Getting them all to stop where you want them to is...less easy.