Investigators said earlier a power surge caused the train to stall and several cars to come off the rails between the Slaviansky Boulevard and Park Pobedy stations.
"It braked very hard. The lights went off and there was lots of smoke," a man, his nose bloodied, told Rossiya-24 television.
While the Moscow metro system has been targeted by bombers in the past, terrorism is not suspected in today's disaster.
Claimed When Castro took power, Americans fled Cuba and left a lot of property behind. Now the claims on these contested holdings—land, buildings, cars and more—are exciting speculators and could stand in the way of reconciliation.
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The Best of Slate Podcasts Only have time for one podcast this week? Make it this one.
The Craziest Endings in College Football History After the turkey, enjoy some classic finishes.