Finding pictures like this really makes my day. All 13 of these bridge workers are on both RPPCs. I played a game of who’s who and recognized 8 of them for sure.
On the second, two more men in suits are with them, perhaps supervisors. On that one I’m not sure what the workers are sitting on, but it looks like a pressurized machine with some kind of belt.
I find it fascinating to see the faces of those who built those bridges we still cross today; ‘floppy hats and blue collars’ (and Carnegie steel). If by extreme luck I find out what bridge this is I will update this post. It may have been built to let a railroad pass through.
RPPC: AZO triangles. 1904-1918. Private collection.