One of the workers is IDed on the back, the one to the left with the checkered cap and sunglasses (!): Pete Dobrzynski. He was the son of Polish immigrants, born in New York circa 1894. He had a wife, Sophie, and a daughter, Lavina (cute name). This photo is an AZO from between 1918-1930. I think this was taken circa 1920.
I love the composition with the front of the steamer locomotive in the background. While I love photos of dapper gents of the era in studio settings, I also love photos like this, of groups of workers posing together.