Columbia subject headings:
Railroads--United States--Employees.
Railroads--United States--Salaries, pensions, etc.
Harvard subject headings:
Arbitration, Industrial--United States
Collective labor agreements--Railroads--United States.
Labor disputes--United States
Railroads--Employees--Labor unions--United States.
Railroads--Employees--Pensions--United States
Railroads--United States--Employees
Railway Express Agency--Employees.
Wages--Railroads--United States.
Princeton subject headings:
Railroads--Salaries, pensions, etc.--United States.
Railroads--United States--Employees.