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Briefly describe the Portage Railroad:
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The Portage Railroad (more commonly the Allegheny Portage Railroad) was an early 19th-century transportation system in central Pennsylvania that allowed canal boats and freight to cross the Allegheny Mountains as part of the state’s Main Line of Public Works. It used a series of inclined planes with stationary engines and cable-haulage to raise and lower cars up steep slopes, with level track sections between the planes. Built to link the eastern and western canal systems, it was an important engineering solution before continuous rail lines made it obsolete in the mid-1800s; portions are now preserved as the Allegheny Portage Railroad National Historic Site.
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