Columbia subject headings:
Railroad travel--History--19th century.
Railroads--History--19th century.
Space and time--History--19th century.
Harvard subject headings:
Railroad travel--History--19th century.
Railroads--History--19th century.
Space and time--History--19th century.
Princeton subject headings:
Railroad travel--History--19th century.
Railroads--History--19th century.
Space and time--History--19th century.