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| Keywords: ZooExcerpt.png Excerpt of photograph 712B-3 showing 138 kV one-line diagram of Zoo Sub 9 circa 1997 This is part of the electrical supply system for the w Amtrak Northeast Corridor railroad line; installed for the Pennsylvania Railroad in 1935 at Thirtieth Street Station Philadelphia The schematic of the 44 kV system has already been removed and covered in black paint or electrical tape 138 kV circuit breakers numbered R19 and R29 are designated by the enclosing rectangle 138 kV circuit breakers are also visible at Perryville MD; and Thorndale PA These locations correspond to the locations of Phase Break indicators U S Historic American Engineering Record View west within the periphery of the load dispatch model board operator's console is at lower center and button board is at lower right of the photograph; section of model board shown covers substation from Perryman left to Frankford right ; instruments at right center of photograph formerly monitored energy usage and were replaced by computerized monitoring system - Thirtieth Street Station Load Dispatch Center Thirtieth Market Streets Railroad Station Amtrak formerly Pennsylvania Railroad Station Philadelphia Philadelphia County PA hhh pa3881/photos 362732p 1997 Robert C Stewart photographer PD-USGov-Interior-HABS http //lcweb2 loc gov/cgi-bin/displayPhoto pl path /pnp/habshaer/pa/pa3800/pa3881/photos topImages 362732pr jpg topLinks 362732pv jpg 362732pu tif title HAER 20PA 51-PHILA 712B-3 displayProfile 0 http //www loc gov/pictures/item/PA3881/ http //lcweb2 loc gov/cgi-bin/ampage collId pphhcaption fileName pa/pa3800/pa3881/data/hhcaptionpage db recNum 0 Original upload log en wikipedia Fredlyfish4 CommonsHelper en wikipedia ZooExcerpt png 2011-01-02 21 13 Mcg410 564×411× 156039 bytes <nowiki>Excerpt of photograph 712B-3 showing 138 kV one-line diagram of Zoo Sub 9 circa 1997 Note that 44 kV system is covered in black tape and electrical tape Library of Congress Prints Photographs Division http //www loc gov/pictures/item/PA3881/ HA</nowiki> Philadelphia power dispatch center | ||||
