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Keywords:
RAILWAYS,
TELEGRAPHS,
ELECTRICITY,
SIGNALLING,
WORKING,
TRAINS,
ELECTRIC,
SIGNALS,
INSTRUMENTS,
ACCIDENTS,
SAFETY,
TELEGRAPHY,
TRAFFIC,
MANAGEMENT,
NEEDLES,
BLOCKS,
SYSTEMS,
SEMAPHORE,
ELECTROMAGNETS,
COMMUNICATIONS
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© Thomas Telford and ICE
1863
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