Columbia subject headings:
Harvard subject headings:
Community development--Germany--History.
Electric power-plants--Germany--Berlin--History.
Electric railroads--Germany--Berlin--History.
Local transit--Germany--Berlin--History.
Locomotives--Germany--Berlin--Equipment and supplies.
Railroads--Germany--Berlin--Electrification.
Railroads--Germany--Berlin--History.
Princeton subject headings:
Community development--Germany--History.
Electric power-plants--Germany--Berlin--History.
Electric railroads--Germany--Berlin--History.
Local transit--Germany--Berlin--History.
Locomotives--Germany--Berlin--Equipment and supplies.
Railroads--Germany--Berlin--Electrification.
Railroads--Germany--Berlin--History.