Columbia subject headings:
Harvard subject headings:
Railroads, Local and light--United States.
Railroads--Freight--United States
Railroads--United States--Forecasting.
Railroads--United States--Passenger traffic
Railroads--United States--Planning.
Street-railroads--United States
Princeton subject headings:
Railroads, Local and light--United States.
Railroads--Freight--United States.
Railroads--United States--Forecasting.
Railroads--United States--Passenger traffic.
Railroads--United States--Planning.
Street-railroads--United States.