Telegraph block instrument (sending/permissive)
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseTelegraph block instrument (sending/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (sending/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; GNR. Pegging permissive 1-needle 3-position/3-indication ("Train On Line" indication on red, being replaced by "Line Occupied" on yellow). With wood-handle and catch-handle/spike commutator, and large rectangular ivorine plate inscribed "Dn Gds Wrenthorpe North". Claimed ex BR-Clapham.
