Commuter trains on lines north of Boston experienced delays and cancellations this morning due to the cold weather.

Extreme cold impacted Tower A at North Station, a major signal transmission device allowing dispatchers to control movement of trains in and out of the station, said Scott Farmelant, a spokesman for the Massachusetts Bay Commuter Railroad Co., which runs commuter rail service for the MBTA.

At least 20 10- to 15-minute delays were reported and four canceled trains were reported between 7:45 and 8:45 a.m., the station’s peak service hours, he said.

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“It’s sensitive equipment, and the extreme cold weather we experienced impacts the older rail equipment that’s in operation,” Farmelant said.

Problems were reported on the Haverhill, Fitchburg/South Acton, Lowell, and Newburyport/Rockport lines.

Amtrak trains traveling between Washington and Boston are also operating on a modified schedule today due to cold weather problems, but they are expected to be running normally tomorrow, spokesperson Clifford Cole said.