Bridges are a great visual element and provide a bit of drama. When my family lived in Milwaukee many years ago my dad would drive the family down to a canal near the lake where the CNW had a crossing swing bridge. There was a building that was either a switch tower or an interlocking tower trackside. I don't have a place for that on my layout but it would be a great project.
I have scratch built girder bridges based on scale drawings from google research. I will try to find photos. I made this single track 22 inch bridge with blocks between masonite sides.
This a post I made when I was redoing my layout.
Making progress on the deck girder segments:
The decks are assembled and painted. I'm making support columns out of cheap shelf strips that I will paint light green.
I'm not sure if the supports are here to stay. For now I plan to add 2 more supports in each of the two 36 inch sections and 3 more in the 48 inch section. The bridge is to allow rail service to the adjacent buildings but also storage for some cars.
