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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]
*[http://www.utu1904.com/files/Download/GCOR%202005.pdf General Code of Operating Rules, 5th Edition, Effective April 3, 2005]
[[Category:Railway signaling in the United States]]
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