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==External links==
*[http://www.fra.dot.gov/downloads/Research/ord9909.pdf U S Department of Transportation - Compliance with Railroad Operating Rules and Corporate Culture Influences, October 1999]
*[https://web.archive.org/web/20130904121049/http://www.transchool.lee.army.mil/rail-safety/documents/GCOR_6th_ed.pdf General Code of Operating Rules, April 7, 2010]
[[Category:Railway signaling in the United States]]
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