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Subways --- Electric railroads --- -Subways --- -Railroads, Underground --- Underground railroads --- Local transit --- Railroads --- Underground construction --- Urban transportation --- Underpasses --- Electric street-railroads --- Railroads, Electric --- Electricity in transportation --- Public utilities --- Street-railroads --- Electrification --- -Electric railroads --- Railroads, Underground --- Heavy rail rapid transit --- Metros (Subways) --- Rail rapid transit, Heavy --- Tubes (Subways) --- Undergrounds (Subways) --- Transports urbains --- 20e siecle --- Allemagne --- Politique des transports urbains