Excavating a tube railway, Great Northern and City Railway, London, c1903 (1903)

Excavating a tube railway: at work in the 'shield', Great Northern and City Railway, London, circa 1903 (1903). The Great Northern & City Railway constructed underground tunnels to allow electrified trains to run from Finsbury Park to Moorgate opening in 1904 and was bought in 1913 by the Metropolitan Railway. The large underground tunnels accommodated a large mainline train unlike the tube network and became the foundation for the Metropolitan and Hammersmith & City lines. From Living London, Vol. III, by George R. Sims. [Cassell and Company, Limited, London, Paris, New York & Melbourne, 1903]. Artist: Pearson & Son Ltd. (Photo by The Print Collector/Getty Images)