Columbia subject headings:
Railroads and state--United States.
Railroads--United States--Employees.
Railroads--United States--Finance.
Harvard subject headings:
Railroads and state--United States.
Railroads--United States--Employees
Railroads--United States--Finance
Princeton subject headings:
Railroads and state--United States.
Railroads--United States--Employees.
Railroads--United States--Finance.