The Metro-North Railroad Harlem Line, originally chartered as the New York and Harlem Railroad, is an 82-mile (132 km) commuter rail line running north from New York City to Wassaic, in eastern Dutchess County. The lower 53 miles (85 km) from Grand Central Terminal to Southeast, in Putnam County, is electrified with a third rail and has at least two tracks. The section north of Southeast is a non-electrified single-track line served by diesel locomotives. The diesel trains usually run as a shuttle on the northern end of the line, except for rush-hour express trains in the peak direction (four to Grand Central in the morning, four from Grand Central in the evening) and one train in each direction on weekends.