Tuscani01
Senior Member
The Humber Bay Arch Bridge does not have hundreds of diesel trains pass underneath it everyday. Given the amount of trains that will pass under the CityPlace Bridge, they might have to repaint more frequently perhaps.
None of the other bridges over the railway (Spadina, Blue Jays Way, etc.) have any dirt from the trains that pass, and they are plain old concrete, so diesel smoke would stick to them like nothing. If they have no problem with it, I'm sure a metal bridge will also have no problem.