This has been updated with the list from GCOR 7th Edition. Click Here for the Update
Below is a the list of railroads showing in the 6th Edition of GCOR Effective April 7, 2010 as having adopted the General Code of Operating Rules.
Acadiana Railway Company
Meridian and Bigbee Railroad
Adrian & Blissfield Rail Road Company
Meridian Southern Railway, LLC
Alabama & Gulf Coast Railway
Messena Terminal Railroad Company
Alabama Southern Railroad
Michigan Air-Line Railway Company
Alabama & Tennessee River Railway, LLC
Michigan Central Railway
Alabama Warrior Railroad
Michigan Shore Railroad
Alaska Railroad Corporation
Mid-Michigan Railroad, Inc.
Albany & Eastern Railroad Company
Minnesota Commercial Railway Company
Aliquippa & Ohio River Railroad
Minnesota, Dakota & Western Railway Company
Alliance Terminal Railway, LLC
Minnesota Northern Railroad, Inc.
Altamont Commuter Express Rail Authority
Minnesota Prairie Line Incorporated
Alton & Southern Railway
Minnesota Southern Railway
Minnesota Valley Transportation Company
Mission Mountain Railroad
Mississippi Southern Railroad
Mississippi & Tennessee RailNet, Inc.
Apache Railway Company
Mississippi Tennessee Railroad
A&R Terminal Railroad Company
Missouri & Northern Arkansas RR Company, Inc.
Arizona & California Railroad
Missouri & Valley Park Railroad
Arizona and California Railway Company
Modesto & Empire Traction Company
Arizona Central Railroad
Montana Rail Link
Arizona Eastern Railway Company
Mount Vernon Terminal Railway, Inc.
Arkansas Louisiana & Mississippi Railroad
Napa Valley Railroad Company
Arkansas Midland Railroad Company Inc.
Nashville and Eastern Railroad
Arkansas & Missouri Railroad Company
Nashville and Western Railroad
Arkansas Southern Railroad
National Coal Rail Line
Ashtabula, Carson & Jefferson Railroad
Nebkota Railway, Inc.
AT&L Railroad Company
Nebraska Central Railroad Company
Atlantic & Western Railway
Nebraska Kansas Colorado Railway, Inc.
Austin Western Railroad
Nebraska Northeastern Railway Company
Baton Rouge Southern Railroad
New England Central Railroad, Inc.
Bauxite & Northern Railway
New Mexico Rail Runner Express
Bay Line Railroad
New Orleans & Gulf Coast Railway Company
Belt Railway Company of Chicago
New Orleans Lower Coast Railroad
BHP Nevada Railway Company
New Orleans Public Belt Railroad
Blackwell Northern Gateway Railroad
Newburgh & South Shore Railroad Company
New York & Atlantic Railway
Boise Valley Railroad
North Carolina & Virginia Railroad Company, Inc.
Buckingham Branch Railroad
Northeast Illinois Regional Commuter Railroad Corp.
Buffalo & Pittsburg Railroad
Northern Indiana Commuter Transportation District
California Northern Railroad
Northern Lines Railway
California Western Railroad
Northern Ohio & Western Railway
Camas Prairie RailNet, Inc.
Northern Plains Railroad
Ohio & Pennsylvania Railroad
Caney Fork & Western Railroad
Ohio Central Railroad
Canon City and Royal Gorge Railroad
Ohio Southern Railroad
Carolina Piedmont Railroad
Omaha, Lincoln & Beatrice Railway Company
Carrizo Gorge Railway
Osceola and St. Croix Valley Railroad Company
Cascade and Columbia River Railroad
Otter Tail Valley Railroad Company, Inc.
Cedar Rapids & Iowa City Railway Company
Pacific Harbor Line
Central California Traction Company
Pacific Sun Railroad
Central Illinois Railroad
Palouse River and Coulee City Railroad
Central Kansas Railway
Panhandle Northern Railroad
Central Midland Railway
Pecos Valley Southern Railway Company
Central Montana Rail
Pend Oreille Valley Railroad
Central Oregon & Pacific Railroad, Inc.
Peninsula Corridor Joint Powers Board (Caltrain)
Central Railroad of Indiana
Pennsylvania Southwestern Railroad
Central Railroad of Indianapolis
Pittsburgh Industrial Railroad
Charlotte Southern Railroad Company
Pittsburgh & Ohio Central Railroad
Chattahoochee Bay Railroad
Point Comfort & Northern Railway Company
Chattahoochee Industrial Railroad
Port Bienville Railroad
Chattooga & Chickamauga Railway
Port of Tillamook Bay Railroad
Chesapeake & Albemarle Railroad Company, Inc.
Portland & Western Railroad
Chicago, Ft. Wayne & Eastern Railroad
Portland Terminal Railroad Company
Chicago Rail Link
Progressive Rail Inc.
Chicago SouthShore & South Bend Railroad
Puget Sound & Pacific Railroad
City of Prineville Railway
Rarus Railway, Inc.
C&NC Railroad Corporation
Red River Valley & Western Railroad Co.
Columbia Basin Railroad Co.
Riceboro Southern Railway
Columbia and Cowlitz Railway
Richmond Pacific Railroad
Richmond Terminal Railroad Company
Columbus & Greenville Railway
Rio Valley Switching Company
Columbus & Ohio River Railroad
Rochester & Southern Railroad
Rockdale, Sandow & Southern Railroad Company
Connecticut Southern Railroad
Saginaw Valley Railroad Company
Corpus Christi Terminal Railroad
San Diego & Imperial Valley Railroad Company, Inc.
Council Bluffs Railway
San Diego Northern Railway
San Francisco Bay Railroad
Dakota, Minnesota & Eastern Railroad
San Joaquin Valley Railroad Co., Inc.
Dakota, Missouri Valley & Western Railroad, Inc.
San Luis Central Railroad Company
Dakota Southern Railway
San Pedro and Southwestern Railway Company
Dallas, Garland & Northeastern Railroad, Inc.
Sand Springs Railway Company
Dardanelle & Russellville Railroad
Santa Cruz, Big Trees & Pacific Railway Company
Decatur Junction Railway Company
Santa Fe Southern Railway, Inc.
Denver Rock Island Railroad
Sault Ste. Marie Bridge Company
DeQueen & Eastern Railroad Company
Savage Bingham & Garfield Railroad Company
Detroit Connecting Railroad Company
Savannah Port Terminal Railroad
East Tennessee Railway
SEMO Port Railroad
Eastern Alabama Railway
Sierra Railroad Company
Eastern Idaho Railroad
South Buffalo Railway
Ellis & Eastern Company
South Carolina Central Railroad Company, Inc.
Escanaba & Lake Superior Railroad
South Central Tennessee Railroad
South East Kansas Railroad
First Coast Railroad
South Kansas and Oklahoma Railroad
Florida East Coast Railway
South Plains Lamesa Railroad Ltd.
Fordyce & Princeton Railroad
Southern California Regional Rail Authority
Fort Worth & Western Railroad
Southern Switching Company
Fox Valley & Western
Southwestern Railroad Company, Inc.
Fulton County Railway, LLC
St. Croix Valley Railroad Company
St. Maries River Railroad Company
Gateway Western Railway
Stillwater Central Railroad
Georgetown Railroad Company
Tacoma Municipal Belt Line Railway
Georgia Central Railway
Talleyrand Terminal Railroad
Georgia & Florida Railway
Tazewell & Peoria Railroad
Georgia Southwestern Railroad, Inc.
Tecumseh Branch Connecting Railroad Company
Georgia Woodlands Railroad
Tennessee Valley Railroad Museum, Inc
Golden Isles Terminal Railroad
Tennken Railroad Company Inc.
Golden Triangle Railroad
Terminal Railroad Association of St. Louis
Grain Belt Corp
Texas – New Mexico Division
Grand Canyon Railway
Texas North Western Railway Company
Grand Elk Railroad
Texas Northeastern Railroad
Grand Rapids Eastern Railroad
Texas, Gonzales & Northern Railway Company
Great Northwest Railroad
Texas Rock Crusher Railway Co.
Great Western Railway
Timber Rock Railroad
Gulf Colorado & San Saba Railroad
Toledo, Peoria & Western Railway
Huron and Eastern Railway Company, Inc.
Hutchinson and Northern Railway Company
Transportación Ferroviaria Mexicana
Idaho Northern & Pacific Railroad Company
Trinity Railway Express
Illinois & Midland Railroad, Inc.
Trona Railway Company
Illinois Railway, Inc.
Tulare Valley Railroad
Indiana & Ohio Railway
Tulsa-Sapulpa Union Railway Company
Indiana Rail Road Company
Twin Cities & Western Railroad Company
Indiana Southern Railroad, Inc.
Union Pacific Railroad
International Bridge & Terminal Company
United States Army Military Railroad System
Iowa Chicago & Eastern Railroad
Utah Central Railway
Iowa Interstate Railroad Ltd.
Utah Railway Company
Iowa Northern Railway Company
Utah Transit Authority
Jaxport Terminal Railway
V&S Railroad Inc.
Kansas City Southern Railway
Kansas City Terminal Railway Company
Ventura County Railway Company
Kansas & Oklahoma Railroad
Verde Canyon Railroad
Kaw River Railroad
Vicksburg Southern Railroad
Kentucky West Tennessee Railway
Virginia Southern Division
Keokuk Junction Railway Company
Wabash Central Railroad
Kettle Falls International Railway, LLC
Warren & Trumbull Railroad
WATCO Transportation Services
Kyle Railroad Company
West Tennessee Railroad, LLC
Lahaina Kaanapali & Pacific Railroad
West Tennken Railroad Corp.
Lake Superior and Ishpeming Railroad
West Texas and Lubbock Railroad
Lapeer Industrial Railroad Company
Wichita, Tillman & Jackson Railway
Lewis and Clark Railway Company
Willamette & Pacific Railroad, Inc.
Little Rock and Western Railway, LP
Willamette Valley Railroad
Longview Switching Company
Willamina and Grand Ronde Railway
Los Angeles Junction Railway
Wilmington Terminal Railroad
Louisiana and Delta Railroad Company
Wisconsin & Southern Railroad Company
Louisiana Southern Railroad
Wyoming/Colorado Railroad Company
Luxapalila Valley Railroad
Yellowstone Valley Railroad
Mahoning Valley Railroad
Manufacturers Junction Railway
Youngstown & Austintown Railroad
Maryland Midland Railway
Youngstown Belt railroad
Maumee & Western Railroad
Yreka Western Railroad
McCloud Railway Company