Columbia subject headings:
Railroads--Employees--Pensions--United States.
Railroads--United States--Employees.
Railroads--United States--Salaries, pensions, etc.
Wages--Railroads--United States.
Harvard subject headings:
Railroads--Employees--Pensions--United States
Railroads--United States--Employees
Wages--Railroads--United States.
Princeton subject headings:
Railroads--Employees--Pensions--United States.
Railroads--United States--Employees.
Wages--Railroads--United States.