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Keywords:
WATERLOO & CITY RAILWAY,
SIGNALLING,
RAILWAYS,
UNDERGROUND,
BLOCKS,
INSTRUMENTS,
TRANSMISSION,
SIGNALS,
LAMPS,
FOULING,
BARS,
POINTS,
DETECTORS,
LONDON,
WATERLOO,
ENGLAND,
CITY RAILWAY,
UK
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© Thomas Telford and ICE
1901
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