An Orange Line train headed to Vienna took a wrong turn at Rosslyn around 3:00 p.m., going on the Blue Line before offloading passengers at the Arlington Cemetery Metro stop.

Both lines were delayed, according to WMATA, which reported the incident as a disabled train and a train malfunction. At 3:48 p.m., WMATA tweeted that the Blue and Orange line resumed normal service.

This is the second time in the last six days that an Orange Line train has been accidentally routed to the Blue Line. Last Wednesday, it occurred at the end of the morning rush hour.

Metro spokesman Dan Stessel said only “one or two trains saw minor delays as a result,” and characterized the mishap as “a minor inconvenience for passengers” in an email. Stessel said a signal issue was the cause of the problem and there were no safety issues for passengers.