Graffiti has always had a target that was the main target. At first it was trains in New York that was the big shit, and then it was just walls where you could get a piece up, and now freights are big. For Baltimore I d have to say MTA, the busses, cuz they are paintable. The lightrail was designed after New York and the other cities so they know better not to make them steel or make them paintable. The lightrail s been developed out of some sort of synthetic plastic so its gonna wipe right off.
Freights go all country or up and down a certain coast.
But I think as far as trains go, only writers are noticing them. Like cop cars. Yeah cop cars. But lot of cars are equipped with cameras. Hit the backs of them, not the front.