Telegraph Block Instrument; Lancashire & Yorkshire Railway, 3 position type, complete with tapper, case stamped "L and YR" (claimed ex BR-Clapham) Telegraph Block Instrument; Lancashire & Yorkshire Railway
Single line ground frame lock, ex Luton East, London & North Eastern Railway, associated with BR (LMR) Dunstable-Ayot section conversion, 1950 (see 2003-7493). Single line ground frame lock
Tablet Instrument, Tyers patent permissive slide release plunger, metal cased instrument on wooden stand. Tyers patent permissive slide release plunger
Tablet Instrument; Tyers patent permissive slide release plunger; metal cased instrument on wooden stand Tyers patent permissive slide release tablet instrument