 The eastern part of the PRR's main line (east of Lancaster) was built by the Commonwealth of Pennsylvania as part of the Main Line of Public Works, a hybrid railroad and canal corridor across the state.The system consisted of the Philadelphia and Columbia Railroad from Philadelphia west to Columbia on the Susquehanna River, the Eastern Division Canal from Columbia to Duncan's Island, the Juniata Division Canal from Duncan's Island to Hollidaysburg, the Allegheny Portage Railroad from Hollidaysburg to Johnstown, and the Western Division Canal from Johnstown to the terminus in Pittsburgh.The Philadelphia and Columbia Railroad had one inclined plane at each end; the Allegheny Portage Railroad had ten.