Green Line passengers faced delays Tuesday morning after a train had a brake problem at the Shaw-Howard University station around 8 a.m.
Metro said delays were running about 25 to 30 minutes, although some riders reported much longer delays.
"Worst.commute.ever. Hour + underground slammed up against justifiably angry commuters- this is what our high fares & taxes pay for?" wrote Twitter user @SarahESaxton.
@llcdillon tweeted, "#wmata charged me $3.45 to waste an hour or my time - [this is] why people choose to drive and metro has funding problems #outrageous"
The disabled train was moved out shortly before 9 a.m., but Green and Yellow trains had to single-tracke between U Street and Mt. Vernon Square, leading to more delays. Single-tracking ended around 9 a.m. but the delays remained for the better part of an hour, and spread throughout the system.
"Anyone wanna tweet me when you can see the platform at pentagon city so I can leave Starbucks and start my day?" wrote @brittann84.
Riders in Virginia saw delays of 15-20 minutes, the transit agency said, mostly between Largo Town Center and Mt. Vernon Square.
Again, some Twitter users said delays were longer than Metro was reporting.
"#wmata ruining another day with terrible service. Blue line running 40 minutes behind... That's If you can even squeeze on the next train," tweeted @bassett_jb.
A rumor that riders self-evacuated in a tunnel is not true, Metro told News4 transportation reporter Adam Tuss. However, someone did open train doors to a platform, causing longer delays for Metro. Riders should never attempt that unless told to, according to Metro.
Metro said normal service resumed around 9:45 a.m.