These PRR interlocking diagrams cover the Harrisburg Division including the Enola classification and hump yard. The original diagrams fold out to as long as 55 inches, all scans are original size.
This is a scan of an original PRR Eastern Region, Harrisburg Division, Block Stations, Interlockings Diagram Book. Updated to 1968. 21 pages. Page sizes range from 10×6 to 55×6 and 12×24 inches.
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