The Metropolitan Washington Airports Authority is trying to determine why a Silver Line test train derailed Tuesday near Wolf Trap.
The train’s front axle left the track after hitting a derailer, a mechanism designed to derail the train if it goes beyond where it is supposed to travel, Pat Nowakowski, executive director of the Dulles Rail Project, told The Washington Post. No injuries were reported, and the train was taken out of service, he added.
The train was traveling about 5 mph when the incident occurred. This is the first time a test train has derailed.
MWAA has been testing the trains for several months. Phase I of the rail line, which will run from Tysons to Reston's Wiehle Avenue, is nearly complete and is expected to carry the first passengers in January.