Below is a list of all the locomotives actively tracked on HeritageUnits.com.

Amtrak

Atchison, Topeka and Santa Fe Railway

BNSF

Canadian National

Canadian Pacific

Chicago Burlington & Quincy Railroad

Coaster

CPKC

CSXT

Duluth Missabe & Iron Range

Ferry Move

Florida East Coast

GE

Georgetown Rail Equipment Company

Indiana & Ohio Railway

Indiana Harbor Belt

Indiana Railroad

Iowa Interstate Railroad

James E. Strates Circus

Keokuk Junction Railway

Knoxville Locomotive Works

Kyle Railroad

Larry's Truck & Electric

Louisville and Indiana

Maryland Midland

Metra

Metro North Commuter Railway

Milwaukee Road

Minnesota Commercial Railway

Missouri & Northern Arkansas Railroad

Montana Rail Link

New Jersey Transit

New York, Susquehanna & Western Railway

Nickel Plate

Norfolk & Western

Norfolk Southern

Pan Am Railways

Pere Marquette

Progress Rail

Providence & Worcester

Railway Service Contractors Inc

Reading Blue Mountain & Northern Railroad

Soo Line

Southern

Southern Pacific

Spokane Portland & Seattle

The CIT Group/Capital Finance, Inc

Union Pacific

Wheeling & Lake Erie

Wisconsin & Southern