Columbia subject headings:
Railroads and state--United States.
Railroads--Mergers.
Railroads--United States.
Harvard subject headings:
Railroad law--United States--Congresses.
Railroads and state--United States--Congresses.
Railroads and state--United States.
Railroads--Mergers
Railroads--Mergers--United States--Congresses.
Railroads--United States
Princeton subject headings: