Columbia subject headings:
Pensions--Law and legislation--United States.
Railroads--Employees--Pensions--Law and legislation--United States.
Unemployment insurance--Law and legislation--United States.
Wages--Railroads--Law and legislation--United States.
Harvard subject headings:
Railroads--Employees--Pensions--United States
Unemployment insurance--United States.
Princeton subject headings:
Railroads--United States--Salaries, pensions, etc.
Unemployment insurance--United States.