The Gregarious Railfan
Railroad Bridges
Thomas Viaduct
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GPS:  N 39.22183, W 76.71318

Scanner:  (?)

Railroad:  CSX Baltimore Division, Old Main Line

Railfan Access:  River Road offers a limited view, trees limit the view.

Description:  The Thomas Viaduct spans the Patapsco River and Patapsco Valley between Relay and Elkridge, MD. It
was commissioned by the Baltimore and Ohio Railroad; built between July 4, 1833, and July 4, 1835; and named for
Philip E. Thomas, the company's first president.
At its completion, the Thomas Viaduct was the largest bridge in the United States and the country's first multi-span
masonry railroad bridge to be built on a curve. It remains the world's oldest multiple arched stone railroad bridge.  In
1964, it was designated as a National Historic Landmark.  The viaduct is now owned and operated by CSX
Transportation and still in use today, making it one of the oldest railroad bridges still in service. -
Denver Todd is The Gregarious Railfan
Todd Sestero publishes the RAILFAN GUIDES of the U.S.   
Disclaimer: I have not been to this location. Info is from the internet.  I would welcome pictures, additions, or
corrections to this page. Pictures and new info will be credited on the page. e-mail me at