DC Metro Orange Line

Complete disaster on the weekends. Plan an extra 30 minutes to get to your destination on time.

Stretching from the Western Terminus of Vienna VA and passing through downtown DC before heading to the Eastern Termini in New Carrollton MD or Largo Town Center MD, the Orange line includes 26 stations. Some are above ground and some are under ground. Much of the line overlaps and is shared with either the Blue Line or the Silver Line. The Orange Line opened in 1978 and runs a distance of 26.4 miles.
During peak times, trains run every six minutes which is usually often enough though I’ve seen that they occasionally bunch up. During off-​peak times, the schedule says that they run every 20 minutes but that can stretch a bit to even 30 minutes for a train to arrive. And of course, the Metro does not run around the clock, starting at 5AM on weekdays and 7AM on weekends. And the last train is at midnight for Sunday to Thursday and 3AM on Friday and Saturday. Kinda lame.
WMATA has a single rolling stock — all the cars fit on all of the tracks. The cars are usually in pretty good shape.