From an early newspaper item about the Washington, D.C. train crash:
The trains crashed just after 5 p.m. on the Red Line of the Metro train system. Catoe said one train was stopped near the Fort Totten stop waiting for a train to leave the next station. The second train came up from behind. The crash propelled the second train on top of the stopped train.
Catoe said the female operator of the second train died.
Bolds mine.