Telegraph block instrument (absolute/permissive)

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Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum

Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum

Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum

Telegraph block instrument; LMS (LNWR Fletcher's Style No. 4269). Combined 2-needle permissive pegging/non-pegging 3-position/3-indication. Has circular bakelite-commutator/permissive tell-tale window set in a large brass disc, and at RHS a permissive plunger and blockbell-tapper at bottom RHS (door), with underslung bell-dome. To top window-door RHS, there are 2 embossed-metal 'Absolute/Permissive' flaps, 1 for each needle. Claimed ex BR-Clapham.

Details

Category:
Signalling & Telecommunications
Object Number:
1994-7129
type:
telegraph block instrument
credit:
British Rail, Clapham

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