The Bollman Truss Railroad Bridge is a landmark of industrial design and construction.
The Thomas Viaduct is an arched stone railway bridge spanning the Patapsco River between Baltimore County and Howard County.
The Carrollton Viaduct is a historic stone arch bridge located over Gwynns Falls in Baltimore.
The Amtrak Railroad Anacostia Bridge is a major railway thoroughfare in Washington, D.C.
The Anacostia Railroad Bridge is a vertical lift bridge crossing the Anacostia River in Washington, D.C.