Metro-North's Harlem Line, originally chartered as the New York & Harlem Railroad, is an 82-mile (132 km) commuter rail line running north from New York City into eastern Dutchess County. The lower 53 miles (86 km) from Grand Central Terminal to Southeast, in Putnam County, is electrified with a third rail and has two (or more) tracks; north of that point, trains use diesel locomotives on a single track.