At nearly 1200 feet long the Delaware, Lackawanna, and Western’s viaduct over the Paulins Kill River near Hainesburg, NJ was, at least from 1911 through 1915, the largest reinforced concrete structure in the world. It was surpassed in that latter year by another DL&W bridge further west in Pennsylvania. Just another superlative on the improbable, impressive, and some might say environmentally regrettable Lackawanna Cutoff Route, the bridge today is a monument, an attraction, an ecosystem, and a permanent reminder of the risks of railroading in the Highlands.