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Keywords:
GREAT WESTERN RAILWAY,
GWR,
RAILWAYS,
SIGNALLING,
TIME,
SPACE,
MANUAL,
DISTANCE,
INTERLOCKING,
TRACK,
CIRCUITS,
COLOURS,
LIGHTS,
OVERLAPPING,
ELECTRICAL,
TRAINS,
STAFF,
LOCKS,
BLOCKS,
MECHANICAL,
PREVENTION,
COLLISIONS,
TELEGRAPHS,
SAFETY,
MAINTENANCE
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© Thomas Telford and ICE
1945
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