New York — New York's Metro-North Railroad has restored service after a computer system power problem forced it to temporarily stop trains on three of its five lines. Residual delays are expected.

A spokeswoman for the nation's second-busiest railroad says its Hudson, Harlem and New Haven line trains were brought to a halt Thursday night for safety purposes while electricians worked to hook up temporary power to the computer system.

Trains were taken to the nearest stations, where riders were allowed to exit. All trains had power and heat during the two-hour interruption.

The cause of the power problem hasn't been determined.

Metro-North serves 281,000 riders a day in New York and Connecticut. It has experienced a spate of problems in the last year, including a derailment in the Bronx that killed four passengers.