A Boston-bound Amtrak train loaded with passengers got stuck in the Bronx for hours without heat because of what the railroad said Friday was a problem with downed electrical wires.

In a statement, Amtrak apologized to the 160 passengers on its Northeast Regional Train 66, which lost power due to damaged overhead wires.

“Today, we fell short of providing the outstanding service that customers should expect from Amtrak, and we are sorry for the delay and the significant inconvenience, including the loss of heat onboard,” the statement said. “We also regret that some passengers did not receive adequate information about the situation while we worked to fix the problems.”

CBS New York said the train originated in Washington, D.C., and that the train was stranded about four hours, starting at 3 a.m.

Amtrak said the train resumed travel at 7:30 a.m. after power was restored. The Associated Press said the first station reached by the train after service resumed was New Rochelle.

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It was not immediately clear if Amtrak officials met the train at that station — or if any passengers needed assistance.

Amtrak had responded to passengers via Twitter, apologizing and telling them to call the railroad’s customer relations department, according to CBS.