Brooklyn Heights Dispatch
Via Cobblehillcollective

History Lies Beneath Atlantic Avenue

A manhole cover at Court Street and Atlantic Avenue marks the site of the world's first subway tunnel, an 1844 engineering feat that currently remains closed to the public.

By Cobblehillcollective· August 6, 2026
AI-generated summary · read the original →

Commissioned by Cornelius Vanderbilt for the Long Island Railroad, the Atlantic Avenue Tunnel was constructed in 1844 to move steam trains below street level following several pedestrian fatalities. Built using the Roman "cut and cover" method, the half-mile tunnel was completed in seven months by primarily Irish immigrant laborers. It served as a vital link for passengers traveling between Manhattan and Boston via Brooklyn and Jamaica.

Despite its utility, the tunnel faced public opposition due to smoke pollution and suspected lobbying by rival railroad moguls. Operations ceased in the late 1850s, and the site was eventually sealed and forgotten until its rediscovery by Bob Diamond in the 20th century. While Diamond spent years advocating for the site's preservation and education, the tunnel is once again inaccessible to the general public.

Summary by Dispatch AI — read the full story at Cobblehillcollective.

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