The railroad commissioned these blue transferware plates to celebrate its 100th anniversary (1829-1929). They were produced by the Lamberton Company. This 6 3/4" diameter plate depicts the Thomas Viaduct over the Ptapsco River near Washington, D.C., built in 1835. The Back is stamped 1827 - 1927 Baltimore & Ohio Railroad, Scammell's Lamberton China Patented.

The Thomas Viaduct spans the Patapsco River and Patapsco Valley between Relay, Maryland and Elkridge, Maryland, USA. It was commissioned by the Baltimore and Ohio Railroad (B&O) and built between July 4, 1833, and July 4, 1835. It is named for Philip E. Thomas, the company's first president.

At its completion, the Thomas Viaduct was the largest railroad 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. In 2010, the bridge designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers.

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.

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