The Metro-North main lines the Hudson, Harlem, and New Haven run northward from NewYork City's GrandCentralTerminal into suburban NewYork and Connecticut.
About 700 people were on board the Metro-North trains when one heading east from NewYork City's GrandCentralTerminal to New Haven derailed at about 6:10 p.m. just outside Bridgeport, transit and Bridgeport officials said.