Atlantic Avenue Railroad

It later became part of the Nassau Electric Railroad, but is now divided between the active Atlantic Branch of the LIRR and the unused Cobble Hill Tunnel, which is preserved in its original state, albeit without service tracks.

[1] The Long Island Rail Road was chartered in 1834 to extend the line east to Greenport.

[3][4] The Brooklyn Central Railroad was incorporated on August 31, 1859, to take over the Brooklyn and Jamaica Railroad, then operated by the Long Island Rail Road as a steam-powered line, for a horse car service once the LIRR completed their new line to Long Island City.

[5] The city authorized them on June 6 to lay tracks on Atlantic Avenue west of Boerum Place (where the Brooklyn and Jamaica passed through the Cobble Hill Tunnel); east of there, they would use the Brooklyn and Jamaica trackage.

[9] The Cobble Hill Tunnel remained empty and unused (despite several urban legends about illegal use) until its rediscovery in 1981.