BRIDGEPORT, Conn. (AP) Metro-North Railroad says a water leak from a burst frozen sprinkler line entered a power substation at Grand Central Terminal, causing delays on Tuesday into and out of New York City.

The Metropolitan Transportation Authority on its website says an overhead water leak Tuesday afternoon triggered the substation's automatic safety mechanism to shut.

The shutdown cut the power supply to numerous tracks, causing delays of up to 40 minutes.

Crews manually reconfigured the power supply yesterday.

The source of the water leak was traced to a frozen sprinkler line that burst in the Waldorf-Astoria's garage.