Columbia subject headings:
Harvard subject headings:
Railroad engineering--Spain--Galicia (Region)--History--19th century.
Railroad engineering--Spain--Galicia (Region)--History--20th century.
Railroads--Spain--Galicia (Region)--History--19th century.
Railroads--Spain--Galicia (Region)--History--20th century.
Princeton subject headings:
Railroads--Poland--History.