THE BRITISH ARMY IN NORTH AFRICA, SICILY, ITALY, THE BALKANS AND AUSTRIA 1942-1946 - D8 Tractors are used to push aside swathes of earth above the caved-in length of tunnel. They also push down the top layers at the entrance to the cutting, in order to lighten pressure on the lower layers, where the mechanical excavators are at work. Photographic negative , British Army

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