Update 5/22: Metro says a master controller issue was the cause of Sunday’s door malfunction on a 3000-series train. The transit agency put the series cars back on the tracks Wednesday morning.

Twenty-six other railcars had similar issues, but now have been fixed. The master controller accelerates and brakes the train. A sensor should have prevented the train from moving with the doors open.

The trains were out of service a little more than 24 hours, but — according to MetroHero, an independent performance tracker of Metrorail — the Red Line experienced some crowding. Metro says it doesn’t expect any further service impacts.

Original:
Metro took all of its 3000-series trains out of service Tuesday morning, causing some delays.

The decision came after a rider posted a video of a train door on car 3090 that was open while it was moving.

Claudia Sol was riding on the Orange Line on Sunday when she noticed both doors were open. She took out her phone to record the incident near Dunn Loring. Eventually, one of the doors closed.

Sol posted the video to a popular D.C. transit Facebook group on Monday. She said she didn’t immediately notice the door was open but kept watching and wondering if it was going to close. “It definitely wasn’t safe,” she said.

Metro says it is voluntarily taking the 284 3000-series cars out of service, which cuts its train availability by about 15 percent.

As a result, you may notice more 6-car (vs 8-car) trains. We have also resumed Grosvenor turnbacks, making 32 addl cars available. Every effort will be made to keep normal train intervals. Apologies for any inconvenience. Your safety is our highest priority. #wmata (2/2)

— Metro Forward (@wmata) May 21, 2019

Most lines saw trains arriving two to five minute longer than usual, according to MetroHero, an independent Metro performance app. Riders reported crowding on some lines as well.

The Yellow and Silver Lines seem virtually unaffected by the railcar shortage this morning, but if you're riding any other lines, you're going to notice the pinch; average headways are currently 2 to 5 minutes longer than usual on the Red, Orange, Blue, and Green Lines. #wmata https://t.co/8dNXwFkECY

— MetroHero (@dcmetrohero) May 21, 2019

The Breda-manufactured trains were introduced in 1987 and are set to be phased out with 8000-series trains in 2023.

In 2015, Metro pulled about 100 4000-series trains for inspection after a similar open door incident. Those trains were retired in 2017.

This story originally appeared on WAMU.