Metro says two disabled trains in Dupont Circle were responsible for delays that inconvenienced Red Line riders for more than an hour during Wednesday morning’s rush.

Both trains were offloaded at Dupont Circle and taken out of service about 9 a.m. because of brake problems, forcing Red Lines trains in both directions to share one track, Metro said. The single tracking ended about 10:15 a.m. but “residual delays” continued farther along the line in both directions until about 11 a.m.

The Red Line, the oldest of the subway system’s five lines, is often problematic for commuters. Last Nov. 13, for instance, thousands of riders were delayed for periods two and three times longer than their normal trips because of a series of infrastructure mishaps along the line. The transit agency has said that a substantial part of its capital improvement budget is being dedicated to upgrading the Red Line.