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Keywords:
TUNNELS,
RAILWAYS,
CONSTRUCTION,
MOUNTAINS,
GRADIENTS,
GNEISS,
GEOLOGY,
ROCKS,
HEADINGS,
TUNNELLING,
EXCAVATING,
EXCAVATIONS,
MACHINERY,
BOREHOLES,
EXPLOSIVES,
GALLERIES,
DYNAMITE,
BORING,
AIR,
COMPRESSION,
COMPRESSORS,
PNEUMATIC,
TURBINES,
DRILLS,
DRILLING,
TEMPERATURE,
VENTILATION,
ST GOTHARD,
ALPS,
GOESCHENEN,
AIROLO,
SWITZERLAND,
ITALY,
EUROPE
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© Thomas Telford and ICE
1875
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