Columbia subject headings:
Railroads--Freight--Rates--Canada.
Railroads--Freight--Rates--United States.
Railroads--Management.
Harvard subject headings:
Railroads--Freight--Rates--Canada
Railroads--Freight--Rates--United States
Railroads--Management
Princeton subject headings:
Railroads--Freight--Rates--Canada.
Railroads--Freight--Rates--United States.
Railroads--Management.