On August 28, 1991, a sleep-deprived and intoxicated motorman caused a southbound 4 train to derail north of the 14th Street–Union Square station in Manhattan. The train was diverted from the express track to the local due to repairs, and the motorman sped through the switch at ; as a result, the first car made the switch while several other cars in the consist did not. Five riders were killed, and several dozen were injured. Cars 1435–1437 and 1439–1440 were wrecked in this accident; cars 1435, 1437, and 1439–1440 were scrapped by 2001, while 1436 was reefed in February 2008. The remaining five cars of the consist (cars 1431–1434 and 1438) are now unitized.