Rail damage marker

[Green]

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.

The rail line is not broken except at the rail bridge itself. If it was, it would be shown as discontinuous and would also have a hazard symbol displayed, closer to the centre of the hex. Both bridge damage and rail damage icons would be visible, at least partially.

Normal rail breaks are at the centre of the hex rather than at a hexside and so no red circle designating a hexside is associated with them. Only damaged rail bridges cause a rail break at the hexside. This is what is shown in the image.