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Block instrument (sending/receiving)

Single-needle block instrument

1845

Block instrument (sending/receiving) - Caledonian Railway

Clark's block signalling telegraph instrument, 1854

1854

Intermediate block instrument

Two-plunger block instrument pattern 288

Block instrument

Block instrument (sending)

Block instrument (sending/receiving)

Block instrument (sending/receiving)

Block instrument (permissive indicating)

Block instrument (lock and block)

1897

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; Tyers Patent; 2-position type

Train describer (receiving) Great Western Railway

Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co

Telegraph block instrument

Block instrument, Great Central Railway (sending)

Telegraph Block Instrument, Signal Relay, Great Western Rail

Telegraph Block Instrument, Spagnoletti type

Telegraph block instrument, old form of bell instrument

Telegraph block instrument

Telegraph block instrument

Telegraph Block Instrument, Great Western Railway

Telegraph Block Instrument, Great Western Railway Spagnoletti receiving type

Train describer (receiving)

Single-needle telegraph block instrument

Tyer's One-Wire Three Indication Block Instrument

Block instrument with spagnoletti flag indicator (incomplete); GWR. Tyer's style

Three-wire block instrument

London & North Eastern Railway train describer

1923-1948

Telegraph block instrument, London Brighton & South Coast Railway

Lancashire & Yorkshire Railway Signalling School Model Railway Layout

1912

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, Great Western Railway

Siemens Bros. block

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

Block instrument (sending)

Telegraph Block Instrument, Lock & Block Type, W R Sykes & Co

Block instrument (sending/receiving)

Telegraph block instrument, block bell, ground frame type

Telegraph Block Instrument, Great Western Railway