Metro-North service has been restored after all trains traveling between New York and Connecticut were halted due to signal problems Thursday night, but MTA officials warn commuters to expect residual delays of up to 35 minutes.

There will also be substitute bus Service on the Danbury Branch for the 7:33 a.m. train leaving South Norwalk this morning.

MTA officials said a problem in the control room at Grand Central Terminal forced trains to stop at the stations nearest them or before track interlockings. All trains had power, light and heat.

Service was restored by 9:40 p.m. and trains have begun running again, according to the MTA.

An announcement at the Fairfield Metro Station said trains were delayed an hour and a half.

The railroad has asked police in towns where stations are located to assist with crowd control, New Haven police spokesman David Hartman said on Thursday night.

Signal problems began just before 8 p.m. on Thursday, and Metro-North issued the following alert around 8:30 p.m.:

"Hudson, Harlem and New Haven Line service is currently stopped due to signal issues. Appropriate personnel are responding. We will provide additional details as they become available."

A passenger on a train from Grand Central to Milford said officials announced that the main computer at Grand Central Terminal had crashed and that train service would be suspended indefinitely.

Commuters were advised to get off the train and find alternate forms of transportation.

Amtrak service from New York to New Haven was also delayed as a result.