In addition to regular cellular service, emergency 911 calls can also be made by Metro riders. In the event of an emergency, riders are reminded to first contact the train operator via the emergency intercom system located on board trains and on station platforms.
D.C. Metro working on deal with wireless carriers to end tunnel dead spots
The lack of cell phone coverage was exposed most recently after the Jan. 12 smoke incident at L’Enfant Plaza when passengers aboard Yellow Line train No. 302 struggled to connect to 911 as smoke filled the railcars just a few hundred feet south of the station platform.