UNDERGROUND ELECTRIC RAILWAY LONDON METHODS OF CONSTRUCTION. lar traffic. This in itself was no light task. The majority of the London streets below the surface are thickly intersected with gas mains sewers pneumatic Sinking a Caisson Preparatory to Excavating the Tunnel. Shepherd's Bush Station Tunnel 21 Feet Diameter Showing the Two -Foot Tunnels for the Tracks. Electric Excavator Showing the Buckets Working on the Face of the Clay Within the Shield. Electric Excavator; the Controlling Gear and Driver's Platform. UNDERGROUND ELECTRIC RAILWAY LONDON—METHODS OF CONSTRUCTION., scientific american, 1900-08-11
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