Metro subway service was disrupted on the Blue, Orange and Red lines during morning rush hour yesterday after two trains broke down, causing delays for thousands of commuters.

Metro officials said that passengers were delayed up to 35 minutes as additional trains were dispatched to remove the malfunctioning trains. Thirteen extra buses also were called in to help transport commuters between the New Carrollton and Eastern Market rail stations.

The breakdowns were attributed to an overloaded propulsion motor on a Blue Line train at the Foggy Bottom-GWU station, and an electronic malfunction that caused brakes to lock on a Red Line train between the Union Station and Rhode Island Avenue stops.

The four-car Blue Line train headed toward Addison Road stalled at Foggy Bottom at 7:07 a.m. with several hundred passengers aboard, officials said. Another four-car train arrived shortly afterward to push the disabled train.

The second train then broke down when it reached the Stadium-Armory station because of overheating in its propulsion system, officials said. Two more trains were dispatched at 7:47 a.m. to remove the stalled units, and the train, now 18 cars in length, reached the New Carrollton yard for repairs at 9:27 a.m.

Other Blue and Orange Line trains were delayed because they had to be diverted around the malfunctioning train.

Officials said normal service resumed about 9:15 a.m.

The six-car Red Line train headed for Silver Spring stalled at 7:35 a.m., officials said. It was pushed to Rhode Island Avenue by another train and then removed from service at 8:07 a.m. Four other outbound trains were delayed because they had to be shifted around the malfunctioning train, officials said.