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Becky Cole was one of the people waiting for a cab. She said she was on her way home from work and got on the train at a downtown station, but the train stopped and people were kept inside it for 45 minutes. Only then were they told there was an emergency and that they would have to exit at Union Station.

The partial shutdown of the Metro system disrupted the lives of thousands of area residents. Donna Robie said that Metro officials asked her to exit her train at Union Station and that they would provide a shuttle that would take her to a bus stop. But only one shuttle showed up — 45 minutes later.

Monday’s derailment comes more than two years after a subway train derailed near downtown Washington, sending 20 people to the hospital and prompting the rescue of 60 people from a tunnel.

That accident happened after the fifth car of a six-car, northbound train crossed a rail switch and left the tracks. Metro was running trains along one track between the Mount Vernon and L’Enfant Plaza stations when the accident occurred.

In November 2004, a six-car train with no passengers backed into an occupied train that was stopped at the platform in the Woodley Park-Zoo/Adams Morgan station on the Red Line. That crash injured 20 people.