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