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Most railroads are using the Seventh Edition, effective April 1, 2015.
==Adopted by==
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*Acadiana Railway company
*Adrian & Blissfield Rail Road Company
*[[Alabama & Gulf Coast Railway]]
*Alabama Southern Railroad
*[[Alabama & Tennessee River Railway|Alabama & Tennessee River Railway, LLC.]]
*Alabama Warrior Railroad
*Alaska Railroad Corporation
*Albany & Eastern Railroad Company
*Aliquippa & Ohio River Railroad
*[[Alliance Terminal Railroad|Alliance Terminal Railway, LLC]]
*Altamont Commuter Express Rail Authority
*Alton & Southern Railway
*[[Amtrak]]—Chicago Terminal
*[[Amtrak]]—Michigan Line
*[[Amtrak]]—NOUPT
*AN Railway
*Apache Railway Company
*A&R Terminal Railroad Company
*Arizona & California Railroad
*Arizona and California Railway Company
*Arizona Central Railroad
*Arizona Eastern Railway Company
*Arkansas Louisiana & Mississippi Railroad
*Arkansas Midland Railroad Company Inc.
*Arkansas & Missouri Railroad Company
*Arkansas Southern Railroad
*Ashtabula, Carson & Jefferson Railroad
*AT&L Railroad Company
*Atlantic & Western Railway
*Austin Western Railroad
*Baton Rouge Southern Railroad
*Bauxite & Northern Railway
*Bay Line Railroad
*[[Belt Railway Company of Chicago]]
*BHP Nevada Railway Company
*Blackwell Northern Gateway Railroad
*[[BNSF Railway]]
*Boise Valley Railroad
*Buckingham Branch Railroad
*Buffalo & Pittsburg Railroad
*California Northern Railroad
*California Western Railroad
*Camas Prairie RailNet, Inc.
*[[Canadian Pacific]]
*Caney Fork & Western Railroad
*Canon City and Royal Gorge Railroad
*Carolina Piedmont Railroad
*Carrizo Gorge Railway
*Cascade and Columbia River Railroad
*Cedar Rapids & Iowa City Railway Company
*Central California Traction Company
*Central Illinois Railroad
*Central Kansas Railway
*Central Midland Railway
*Central Montana Rail
*Central Oregon & Pacific Railroad, Inc.
*Central Railroad of Indiana
*Central Railroad of Indianapolis
*Charlotte Southern Railroad Company
*Chattahoochee Bay Railroad
*Chattahoochee Industrial Railroad
*Chattooga & Chickamauga Railway
*Chesapeake & Albemarle Railroad Company, Inc.
*Chicago, Ft. Wayne & Eastern Railroad
*[[Chicago Rail Link]]
*Chicago SouthShore & South Bend Railroad
*City of Prineville Railway
*C&NC Railroad Corporation
*Columbia Basin Railroad Co.
*Columbia and Cowlitz Railway
*Columbia Terminal
*Columbus & Greenville Railway
*Columbus & Ohio River Railroad
*Commonwealth Railway
*Connecticut Southern Railroad
*Corpus Christi Terminal Railroad
*Council Bluffs Railway
*D&I Railroad
*Dakota, Minnesota & Eastern Railroad
*Dakota, Missouri Valley & Western Railroad, Inc.
*Dakota Southern Railway
*Dallas, Garland & Northeastern Railroad, Inc.
*Dardanelle & Russellville Railroad
*Decatur Junction Railway Company
*Denver Rock Island Railroad
*DeQueen & Eastern Railroad Company
*Detroit Connecting Railroad Company
*East Tennessee Railway
*Eastern Alabama Railway
*[[Eastern Idaho Railroad]]
*Eastern Washington Gateway Railroad
*Ellis & Eastern Company
*Escanaba & Lake Superior Railroad
*Farmrail Corporation
*First Coast Railroad
*Florida East Coast Railway
*Fordyce & Princeton Railroad
*Fort Worth & Western Railroad
*Fox Valley & Western
*Fulton County Railway, LLC
*Galveston Railroad
*Gateway Western Railway
*Georgetown Railroad Company
*Georgia Central Railway
*Georgia & Florida Railway
*Georgia Southwestern Railroad, Inc.
*Georgia Woodlands Railroad
*Golden Isles Terminal Railroad
*Golden Triangle Railroad
*Grain Belt Corp
*Grand Canyon Railway
*Grand Elk Railroad
*Grand Rapids Eastern Railroad
*Great Northwest Railroad
*Great Western Railway
*Gulf Colorado & San Saba Railroad
*Huron and Eastern Railway Company, Inc.
*Hutchinson and Northern Railway Company
*Idaho Northern & Pacific Railroad Company
*Illinois & Midland Railroad, Inc.
*Illinois Railway, Inc.
*Indiana & Ohio Railway
*Indiana Rail Road Company
*Indiana Southern Railroad
*International Bridge & Terminal Company
*Iowa Chicago & Eastern Railroad
*Iowa Interstate Railroad Ltd.
*Iowa Northern Railway Company
*Jaxport Terminal Railway
*[[Kansas City Southern Railway]]
*Kansas City Terminal Railway Company
*Kansas & Oklahoma Railroad
*Kaw River Railroad
*Kentucky West Tennessee Railway
*Keokuk Junction Railway Company
*[[Kettle Falls International Railway|Kettle Falls International Railway, LLC]]
*Kiamichi Railroad
*Kyle Railroad Company
*Lahaina Kaanapali & Pacific Railroad
*Lake Superior and Ishpeming Railroad
*Lapeer Industrial Railroad Company
*Lewis and Clark Railway Company
*[[Little Rock and Western Railway|Little Rock and Western Railway, LP]]
*Longview Switching Company
*[[Los Angeles Junction Railway]]
*Louisiana and Delta Railroad Company
*[[Louisiana Southern Railroad]]
*Luxapalila Valley Railroad
*Mahoning Valley Railroad
*Manufacturers Junction Railway
*[[Maryland Midland Railway]]
*Maumee & Western Railroad
*McCloud Railway Company
*Meridian and Bigbee Railroad
*Michigan Shore Railroad
*Mid-Michigan Railroad, Inc.
*Minnesota, Dakota & Western Railway Company
*Minnesota Northern Railroad, Inc.
*Minnesota Commercial Railway Company
*Minnesota Prairie Line Incorporated
*Minnesota Valley Transportation Company
*[[Mississippi Delta Railroad]]
*Mississippi & Tennessee RailNet, Inc.
*Missouri & Northern Arkansas RR Company, Inc.
*Missouri & Valley Park Railroad
*Modesto & Empire Traction Company
*[[Montana Rail Link]]
*Mount Vernon Terminal Railway, Inc.
*Napa Valley Railroad Company
*Nebkota Railway, Inc.
*Nebraska Central Railroad Company
*Nebraska, Kansas & Colorado RailNet
*Nebraska Northeastern Railway Company
*New England Central Railroad, Inc.
*Newburgh & South Shore Railroad Company
*New Orleans & Gulf Coast Railway Company
*New Orleans Lower Coast Railroad
*New Orleans Public Belt Railroad
*North Carolina & Virginia Railroad Company, Inc.
*Northeast Illinois Regional Commuter Railroad Corp.
*Northern Indiana Commuter Transportation District
*Northern Ohio & Western Railway
*Northern Plains Railroad
*Otter Tail Valley Railroad Company, Inc.
*Osceola and St. Croix Valley Railroad Company
*Pacific Harbor Line
*Palouse River and Coulee City Railroad
*Pecos Valley Southern Railway Company
*[[Pend Oreille Valley Railroad]]
*Pennsylvania & Southwestern Railroad
*Pittsburgh Industrial Railroad
*Point Comfort & Northern Railway Company
*Port Bienville Railroad
*Port of Tillamook Bay Railroad
*Portland & Western Railroad
*Portland Terminal Railroad Company
*Progressive Rail Inc.
*Puget Sound & Pacific Railroad
*Rarus Railway, Inc.
*Red River Valley & Western Railroad Co.
*Richmond Pacific Railroad
*Rio Valley Switching Company
*Saginaw Valley Railroad Company
*Sand Springs Railway Company
*San Diego & Imperial Valley Railroad Company, Inc.
*[[Coaster (commuter rail)|San Diego Northern Railway]]
*San Joaquin Valley Railroad Co., Inc.
*San Luis Central Railroad Company
*San Pedro and Southwestern Railway Company
*Santa Cruz, Big Trees & Pacific Railway Company
*Santa Fe Southern Railway, Inc.
*Sault Ste. Marie Bridge Company
*SEMO Port Railroad
*Sierra Railroad Company
*South Carolina Central Railroad Company, Inc.
*South Central Tennessee Railroad
*South East Kansas Railroad
*South Kansas and Oklahoma Railroad
*South Plains Lamesa Railroad Ltd.
*Southern Switching Company
*Southwestern Railroad Company, Inc.
*[[Metrolink (Southern California)|Southern California Regional Rail Authority]]
*St. Croix Valley Railroad Company
*St. Maries River Railroad Company
*Stillwater Central Railroad
*Tacoma Municipal Belt Line Railway
*Tecumseh Branch Connecting Railroad Company
*[[Tennessee Valley Railroad Museum]]
*Tennken Railroad Company Inc.
*Texas, Gonzales & Northern Railway Company
*Texas - New Mexico Division
*Texas North Western Railway Company
*Texas Northeastern Railroad
*Texas Rock Crusher Railway Co.
*Timber Rock Railroad
*Toledo, Peoria & Western Railway
*[[Transportación Ferroviaria Mexicana]]
*[[Tri-City Railroad]]
*Trinity Railway Express
*Trona Railway Company
*Tulare Valley Railroad
*Tulsa-Sapulpa Union Railway Company
*Twin Cities & Western Railroad Company
*[[Union Pacific Railroad]]
*United States Army Military Railroad System
*Utah Central Railway
*Utah Railway Company
*[[Utah Transit Authority]] ([[FrontRunner]])
*V&S Railroad Inc.
*Ventura County Railway Company
*Virginia Southern Division
*Wabash Central Railroad
*West Tennessee Railroad, LLC
*West Tennken Railroad Corp.
*West Texas and Lubbock Railroad
*Wichita, Tillman & Jackson Railway
*Willamette & Pacific Railroad, Inc.
*Willamette Valley Railroad
*Willamina and Grand Ronde Railway
*Wisconsin & Southern Railroad Company
*Wyoming/Colorado Railroad Company
*Yreka Western Railroad
{{colend}}<ref>{{cite web|title=General Code of Operating Rules (GCOR)|url=http://trainweb.com/gcor/index.html|accessdate=9 June 2013}}</ref>
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