Probably vandalism... Would you want your car going through Baltimore on an open rail transport? Not me. Also the design’s probably better - more cars in less space...
Maybe the black racists over at the DOJ can give us stats on how many cars were defaced while traveling through traditional white American neighborhoods....
Periodically I'm forced to stop at a RR crossing but the monotony is broken by all the cars with spray painted graffiti on them......lots of good stuff.