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*[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]
*[http://fwwr.net/assets/gcor-effective-2015-04-01.pdf General Code of Operating Rules, April 1, 2015]
*[https://safety.army.mil/Portals/0/Documents/ON-DUTY/MILITARYOPERATIONSANDTRAINING/RAILPORTANDCARGO/Standard/GCOR_8ed_1APR20.pdf General Code of Operating Rules, April 1, 2020]
[[Category:Railway signaling in the United States]]
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