If you look real close, you can see a dummy perched inside the center structure.
This is one of two railroad bridges over the canal that I saw on my walk. I think it was a pivoting bridge, able to be turned out of the way of passing canal traffic. There are no longer any tracks on either side of the canal for it to connect to, and it's turned in the "open" position, I'm guessing permanently. I'll post some photos of the other bridge tomorrow.