WABC 7 reports that a steam main break has caused problems for the 4, 5, and 6 trains. The steam main broke on East 79th Street, between Third and Lexington, and water leaked onto the express tracks. The MTA has classified this as an "ongoing water condition at the 77th Street Station."
While the MTA is trying to pump out the water, some 5 trains are running on the 2 line in both directions between the 149th Street / Grand Concourse Station and the Nevins Street Station. And there are delays on the 4, 5, and 6.