Rail damage marker

[Plain Ian]

I think the problem is not the rail bridge hexside part but the actual rail hex, probably the one to the south west of the bridge? The damaged icon sign for the hex must be showing on the NE part of the hex so that its actually sitting on top of the damaged bridge (rail) hexside icon. 

So only one icon visible showing for the hexside/hex maybe? Just a guess?

Incidentally if the rail line hex is damaged then this will slow travel over the engineering bridge as I suspect the game engine will treat this as a "non transport" type hex. 

Instead of moving rail->eng bridge->rail and gaining the movement benefits, you are moving rail->eng bridge->clear and using the slower movement type for the hex terrain.