Bridges what color?

[Allegheny2-6-6-6]

I'm sitting here at my desk multi tasking I think they call it building a Central Valley single track 72' Plate Girder Bridge as well as looking at pictures of bridges on the net and posting here of course. So I've built several of these bridges two double track versions as well as one other single track one just like this one and of course they are all painted black. Then weathered with grimy black chalk rust what ever. So I'm thinking you know I'm getting board with black even though it may be the general color of choice for bridges. So I was wondering what alternate colors have you guys painted your bridges.