Class I Railroad Links

• Burlington Northern and Santa Fe

• Canadian National

• Canadian Pacific Railway

• CSX Corporation

• Ferrocarril Mexicana (Ferromex)

• Kansas City Southern

• Norfolk Southern

• Transportacion Ferroviaria Mexicano (TFM)

• TTX Company

• Union Pacific Corporation

Regional & Shortline Railroads

• Arkansas & Missouri Railroad

• Aberdeen & Rockfish

• Alaska Railroad

• Anacostia & Pacific Company, Inc.

• BC Rail

• Belt Railway of Chicago

• Canton Railroad Company

• Cedar Rapids & Iowa City Railway Co.

• Chicago, SouthShore & South Bend Railroad

• Conrail Shared Assets LLC

• Dakota, Minnesota & Eastern Railroad

• Durbin and Greenbrier Railroad

• Elgin, Joliet & Eastern 

• Ferrosur

• Ferrocarril y Terminal del Valle de Mexico,S.A. de C.V.
• Genesee & Wyoming, Inc

• Great Lakes Transportation LLC (Duluth, Missabe & Iron Range and Bessemer & Lake Erie)

• Guilford Transportation

• I&M Rail Link

• Indiana Harbor Belt

• Louisville & Indiana Railroad 

• The Morristown & Erie Railway

• New York & Atlantic Railway

• Nobles Rock Railroad, Inc.

• Ontario Northland

• Pacific Harbor Line

• RailAmerica, Inc.

• Reading, Blue Mountain & Northern Railroad

• Red River Valley & Western Railroad Company

• Rio Grande Pacific

• Twin Cities & Western Railroad Company

• Transtar Inc.
• Tri-City & Olympia Railroad

• Willamette & Pacific Railroad

• Wheeling & Lake Erie Railway

• Wisconsin & Southern