The Simple Engineering That Will Keep NYC’s L Train Rolling

Ever since the last of the brackish water slithered out of the Canarsie Tunnel in the aftermath of 2012’s Superstorm Sandy, New Yorkers have been bracing for the pain. Public transit officials have long warned that the water damage to the 94-year-old tunnel, full of just-as-old subway equipment, would eventually require a long, painful, deeply …