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The sign measures 91cms x 51 cms
This instrument is in ex railway service condition
Its sole purpose was to prevent the distant arm showing "OFF" with the Stop arm at danger
Packed with photos
RA 8911 G.W.R. 1947 PATTERN BLOCK INDICATOR parts The sign measures 91cms xA standard Great Western Railway 1947 pattern block indicator manufactured by R. E. Thompson & Co, this example is the more difficult to find "double" contacts on the commutator bar. This overall condition is excellent and all fully working order.
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