In 1857, the Pennsylvania Railroad (PRR) took over Pennsylvania s Main Line of Public Works, a state-owned railroad and canal system built in the 1830s. Costly to build and maintain, and never attracting the traffic needed to sustain it, the state was eager to let it go. Keeping the rail portion and combining it with its own lines, the PRR ultimately developed a well-built and well-run rail line from Philadelphia to Pittsburgh all while keeping the main line moniker. The eastern section between Philadelphia and Harrisburg was especially successful, particularly after the railroad built new...