The Penn Line is a MARC commuter rail service running from Union Station in Washington, D.C., to Perryville, Maryland, along the far southern leg of the Northeast Corridor. However, the great majority of trains terminate at Baltimore's Penn Station. It is MARC's busiest and only electric line. With trains running at speeds of up to 125 miles per hour (201 km/h), it is the fastest commuter line in the United States. The service is operated by Amtrak under contract to the Maryland Transit Administration. MARC sets the schedules, owns most of the stations, and controls fares, while Amtrak owns and maintains the right-of-way, supplies employees to operate trains, and maintains the rolling stock. It is by far the busiest of MARC's three lines, with twice as many trains and twice as many passeng