WMATA is advising commuters that trips on the Red Line, especially between downtown and Glenmont, could be slow-going this afternoon as a train car about to head downtown derailed on a service track adjacent to the Silver Spring station.

There weren’t any customers on board at the time and the driver was not hurt.

The track in question is used by Red Line trains to turn around after completing runs to the Silver Spring terminal stop. Since that track is out of service, every other train headed in the direction of Glenmont will turn around at the Brookland-CUA station.

UPDATE: The Post reports on the derailment and WTOP is reporting that WMATA has resumed sales of SmarTrip cards online, the shortage having apparently passed.