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Keywords:
BETTWS FESTINIOG RAILWAY,
TUNNELS,
RAILWAYS,
CONSTRUCTION,
TUNNELLING,
MACHINERY,
COMPRESSORS,
DRILLING,
MACHINES,
DRILLS,
DRIVING,
BLASTING,
COSTS,
ROCKS,
SHAFTS,
SINKING,
EXPLOSIVES,
COMPRESSED,
AIR,
HARD,
HARDNESS,
BETTWS Y COED,
FESTINIOG,
WALES,
BLAENAU,
UK
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© Thomas Telford and ICE
1883
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