posd

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Pittsburgh Operational Switching District
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General Description
Unlike the other entities listed on the previous page, the Pittsburgh Operational Switching District (or POSD) was not an officially recognized divisional area in the 1940's. Instead, the POSD linked the Pittsburgh termini of the divisions coming into the city from all directions. Pittsburgh was the hub of the Central Region and had traditionally been the break between the PRR and the Pennsylvania Company - Lines East and Lines West. Administrative control of routes in and out of the city changed hands over short distances, so that an inbound train would often cross parts of two or three divisions as it moved around the city. The POSD semi-formally bound the ends of five divisions into a loop around downtown. Beginning on the east at Pitcairn Yard, it followed the Pittsburgh Division main line to 'PERRY', the Port Perry Branch to 'PG', the Monongahela Division main line to 'OB', the Scully Branch to 'ESPLEN', the Ohio Connecting Railway to 'ISLAND AVENUE', the Eastern and Conemaugh division mains up the Allegheny to 'UY', the Brilliant Branch to 'CM', and the Pittsburgh division main again back to Pitcairn. All facilities within this loop were considered part of the POSD, as well as Peter's Creek Yard, Scully Yard, Coleman Yard, and Conway Yard. During the 1920's much of this loop had been established as the Pittsburgh Terminal Division, but for reasons unknown this arrangement ended after only a few years.

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