I remember when this barge was added to it. I think it would be brilliant if this could be done for other vehicles for other route eg: Planes for London Commuter, Vans for Spirit of Steam or School Buses for LIRR. This is a really fun concept and would give something else to be creative with other than just trains.
Its worth noting, the only reason it works for the barge, was IIRC it was designed like an AI train, and not a scenery object like the other bits of traffic you are suggesting, hence why the barge can appear in the livery designer.
