Railroad bridge

[Don Boose]

Images intended for modelers, but alas, no model: The Bollman Iron Truss Bridge - B&O Railroad

Also useful: STRUCTURE magazine | Bollman Truss at Harper’s Ferry
https://www.asce.org/project/bollman-truss-bridge/

Some of these resource may also be in the material Doug posted, and you could hardly do better than the drawings Dwayne posted.

As a B&O fan who grew up in Baltimore when there WAS a B&O Railroad, I'd love to see you build this.

Don