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Metro is inspecting hundreds of railcars after a part fell off an Orange Line train near the Stadium-Armory Metro Station Friday.
A friction ring, which is part of the braking system, fell off a New Carrollton-bound train about noon. A worker noticed the problem and was able to alert the driver of the train, who stopped without issue and was able to return to the station to offload the passengers.
Metro is investigating why the disk fell off the 2000-series car.
Metro General Manager Richard Sarles also ordered inspections of 464 2000-series cars. The 2000-series cars were put into service in the 1980s and 1990s.
In December, Metro tested 194 5000-series cars after a friction ring, which is a redundant part, fell off a train between the L’Enfant Plaza and Smithsonian stations.
Friday's incident was not related. The incidents involved different designs and different manufacturers, Metro spokesman Dan Stessel said.
Friday's malfunction caused delays on the Orange and Blue lines.