Columbia subject headings:
Electric railroads--United States.
Street-railroads--Fares--United States.
Street-railroads--United States--Cost of operation.
Street-railroads--United States--Finance.
Harvard subject headings:
Electric railroads--United States.
Street-railroads--Fares--United States.
Street-railroads--United States--Cost of operation.
Street-railroads--United States--Finance.
Princeton subject headings:
Electric railroads--United States.
Street-railroads--Fares--United States.
Street-railroads--United States--Cost of operation.
Street-railroads--United States--Finance.