The Washington Metropolitan Area Transit Authority announced that they withdrew the 7000-series trains from the tracks for inspections Wednesday.

Officials said in a tweet that the train cars would be removed for “a couple of days this week” while they adjust the cars for inspections. WMATA reinstated the 7000-series rail cars, which make up about 60% of the fleet, in June after they removed the cars from the tracks last October due to a train car derailment that forced WMATA to investigate the safety of the trains.

Metro stated that the current temporary removal will help prevent a “backlog” issue that they experienced last week. They said that the 7000-series removal would not “impact service levels for customers.”

During their original railcar assessment, investigators found defects on the railcars that were considered “out of compliance.” The months-long repair project led to long wait times and nearly 30-minute departure intervals for riders.