Excerpt from a 1951 PRR Pittsburgh Division, Central Region track chart, showing the Mainline from SG located in the Western Suburbs of Johnstown to Conpitt Junction, 14 miles to the West, which was the end of the Low Grade Sang Hollow Branch and beginning of the Conemaugh Main, a slower route which provided an easier profile for heavy drags and mineral trains into Pittsburgh. The chart was provided from the  PRR Multmodalways Online Archive
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