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London built a 6.5-mile driverless railway 70 feet beneath its streets to beat traffic and fog, with electric trains carrying parcels from 1927 before the underground network began transporting letter...
London’s Mail Rail began as an underground railway designed to move post across the capital and was proposed after congested streets and fog delayed mail. The electric line had driverless trains and ran through six and a half miles of tunnels, about 70 feet below ground.