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