The Philadelphia to Harrisburg Main Line is an electrified rail line owned and operated by Amtrak in the U.S. state of Pennsylvania. The line runs from Zoo interlocking (MP 1.9) in Philadelphia, where it meets the Northeast Corridor, west to Harrisburg (MP 104.6), where electrification ends. It is part of the longer Keystone Corridor, which continues west to Pittsburgh along the Norfolk Southern Railway's Pittsburgh Line.