Columbia subject headings:
Brotherhood of Locomotive Engineers (U.S.)
Brotherhood of Locomotive Firemen and Enginemen.
Brotherhood of Railroad Trainmen.
Order of Railway Conductors and Brakemen.
Order of Railway Conductors of America.
Railroads--United States--Employees.
Harvard subject headings:
Princeton subject headings:
Brotherhood of Locomotive Engineers (U.S.)
Brotherhood of Locomotive Firemen and Enginemen.
Brotherhood of Railroad Trainmen.
Order of Railway Conductors and Brakemen.
Railroads--United States--Employees.