Effect acid rain has on things made from metal such as cars trainsbuses and other means of transport?

Acid rain has multiple effects on almost everything man-made, but "erosion" is one of the most common. Just like the way huge bolders turn into sand over time, little flakes of metal and paint flake off of public transportation over time. This is why you sometimes see a bus rolling by with a somewhat faded advertisement, or a rusty boxcar on a freight train. Hope this helped, Lilmomo1

Adding to his sometimes if the metal is weak the acid rain will make little holes on the metal