Why are there delays on the Metro in Washington DC this morning?

WMATA said 11 people were injured after a work vehicle struck a stationary metrorail train in DC. There are now widespread delays Wednesday morning.
Hoodline

Midnight Metro Mayhem: WMATA Work Car Slams Train, 11 Hurt At Metro Center

Just after midnight Wednesday, a WMATA maintenance vehicle on the Silver Line collided with a stationary train at Metro Center, injuring eleven people and shutting down one of the system's busiest transfer points.

Metro's board to vote on budget that calls for fully automated trains on the Red Line

Metro plans $913M Red Line upgrade with fully automated trains and platform doors, aiming for safer, more frequent service amid union concerns.

Metro to vote on driverless trains, platform barriers on Red Line

Metro could start running trains without an operator behind the controls. It might sound crazy, but did you know this is already a thing on a number of subway lines across the world? Take the Copenhagen Metro,