Clark's block signalling telegraph instrument, 1854
1854
Block instrument (sending/receiving) - Caledonian Railway
Block instrument (sending/receiving)
Single-needle block instrument
1845
Block instrument (sending)
Block instrument (sending/receiving)
Block instrument (lock and block)
1897
Two-plunger block instrument pattern 288
Block instrument
Block instrument (permissive indicating)
Block instrument (sending/receiving)
Intermediate block instrument
Lock & Block Type Telegraph Block Instrument
London & North Eastern Railway train describer
1923-1948
Lancashire & Yorkshire Railway Signalling School Model Railway Layout
1912
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Markham North
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Single-needle telegraph block instrument
Telegraph block instrument, old form of bell instrument
Block instrument, Great Central Railway (sending)
Telegraph Block Instrument; Tyers Patent; 2-position type
Telegraph block instrument
Telegraph Block Instrument, Great Western Railway Spagnoletti receiving type
Telegraph Block Instrument, Great Western Railway
Train describer (receiving)
Block instrument with spagnoletti flag indicator (incomplete); GWR. Tyer's style
Train describer (receiving) Great Western Railway
Telegraph Block Instrument, Spagnoletti type
Tyer's One-Wire Three Indication Block Instrument
Telegraph block instrument
Telegraph block instrument, London Brighton & South Coast Railway
Three-wire block instrument
Telegraph block instrument
Telegraph Block Instrument, Signal Relay, Great Western Rail
Train describer, London & North Eastern Railway
1923-1948
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Lock and Block Type Block Instrument
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Siemens Bros. block
Block instrument by J.R. Spagnoletti and Crooks; GNR
Block instrument (sending)
Switch-out block instrument
