Single-needle block instrument
1845
Block instrument (sending/receiving)
Block instrument (sending/receiving) - Caledonian Railway
Clark's block signalling telegraph instrument, 1854
1854
Intermediate block instrument
Block instrument (sending/receiving)
Block instrument (permissive indicating)
Block instrument (lock and block)
1897
Two-plunger block instrument pattern 288
Block instrument (sending)
Block instrument (sending/receiving)
Block instrument
Telegraph Block Instrument; Tyers Patent; 2-position type
London & North Eastern Railway train describer
1923-1948
Block instrument, Great Central Railway (sending)
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Telegraph Block Instrument, Spagnoletti type
Telegraph Block Instrument, Markham North
Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co
Three-wire block instrument
Tyer's One-Wire Three Indication Block Instrument
Block instrument with spagnoletti flag indicator (incomplete); GWR. Tyer's style
Single-needle telegraph block instrument
Train describer (receiving)
Train describer (receiving) Great Western Railway
Lock & Block Type Telegraph Block Instrument
Block instrument by J.R. Spagnoletti and Crooks; GNR
Tyers Type Signalling Block Instrument
Block instrument (sending/receiving)
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, Great Western Railway
Switch-out block instrument
Block instrument (sending)
Telegraph block instrument
Siemens Bros. block
Train describer, London & North Eastern Railway
1923-1948
Telegraph Block Instrument, North Eastern Railway
Block instrument
1899
Telegraph block instrument, Midland Railway
Telegraph block instrument, Lancashire & Yorkshire Railway
Great Western Railway Double Needle Type Block Instrument
1837
Telegraph block instrument, Tyers patent
Train describer (sending)
block instrument from London, Brighton & South Coast Railway
1890