How a coal-hauling railroad built the world's largest concrete arch bridge in New Jersey
In short: The Delaware, Lackawanna and Western Railroad began as a modest coal-mining venture in 1832. It evolved into a massive engineering powerhouse, pioneering reinforced concrete construction and massive line relocations. By the early 20th century, it operated the world's largest concrete arch bridge, transforming the landscape of the American Northeast.
The Delaware, Lackawanna and Western Railroad, or DL&W, originated as the Liggetts Gap Railroad Company, incorporated in Pennsylvania on April 7, 1832. Its primary purpose was to transport anthracite coal from the mines of northeastern Pennsylvania to major markets. The company underwent several name changes, becoming the Lackawanna & Western in 1851 and finally the Delaware, Lackawanna & Western in 1853. By 1851, the railroad had already begun mining coal on its own account, a unique advantage that fueled its early growth.
Under the leadership of president William H. Truesdale, who took office after Samuel Sloan's long tenure, the railroad underwent a massive modernization of its physical plant. To improve grades and clearances, the company undertook two major line relocations across western New Jersey and between Scranton and Binghamton. These projects featured extensive cuts, fills, and viaducts. Among these, the Tunkhannock Viaduct stood out as a feat of engineering; rising 240 feet, it was recognized as the largest concrete arch bridge in the world. The railroad was a pioneer in adopting reinforced concrete for its infrastructure.
The DL&W's prosperity was tied to its ability to supply coal to New York City, New England, and upstate New York. However, the mid-20th century brought significant challenges, including declining coal traffic and losses from commuter services. Following heavy storm damage in 1955, the company pursued consolidation with the Erie Railroad. This merger, which formed the Erie Lackawanna Railroad Company, became effective on October 17, 1960. The legacy of the DL&W remains preserved in extensive archives, including approximately 10,000 oversized drawings and blueprints that document its ambitious engineering history.
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Sources
- Summary by Intellect · source: Delaware, Lackawanna and Western Railroad Records | NMAH.AC.1074 | SOVA, Smithsonian Institution
- Also: Delaware, Lackawanna and Western Railroad
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