Columbia subject headings:
Federal aid to transportation--United States.
Railroads--United States--Finance.
Railroads--United States--Maintenance and repair--Finance.
Harvard subject headings:
Federal aid to transportation--United States.
Railroads--United States--Finance
Railroads--United States--Maintenance and repair--Finance.
Princeton subject headings:
Federal aid to transportation--United States.
Railroads--United States--Finance.
Railroads--United States--Maintenance and repair--Finance.