![](https://coimages.sciencemuseumgroup.org.uk/425/876/large_thumbnail_1994_8783__0001_.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/425/876/large_thumbnail_1994_8783__0001_.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/427/50/large_thumbnail_1997_7908__0007_.jpg)
Permissive block instrument, Great Western/London & North Western Joint Line
![](https://coimages.sciencemuseumgroup.org.uk/61/690/large_thumbnail_b000394.jpg)
Cooke's train signalling instrument of 1845, Norfolk Railway
1845
![](https://coimages.sciencemuseumgroup.org.uk/425/878/large_thumbnail_1994_8785__0001_.jpg)
Signalling instrument
![](https://coimages.sciencemuseumgroup.org.uk/423/803/large_thumbnail_1994_8782__0010_.jpg)
Signalling instrument
![](https://coimages.sciencemuseumgroup.org.uk/419/927/large_thumbnail_1943_9__0007_.jpg)
Spagnoletti intermediate signalling instrument
1885
![](https://coimages.sciencemuseumgroup.org.uk/533/843/large_thumbnail_smg00357639.jpg)
Signalling Instrument, Solenoid Case
![](https://coimages.sciencemuseumgroup.org.uk/533/842/large_thumbnail_smg00357638.jpg)
Signalling Instrument, Flag Type Station Bay Indicator
![](https://coimages.sciencemuseumgroup.org.uk/533/849/large_thumbnail_smg00357645.jpg)
Tyers Signal Repeater Indicator
![](https://coimages.sciencemuseumgroup.org.uk/534/153/large_thumbnail_smg00358039.jpg)
Great Western Railway train describer
![](https://coimages.sciencemuseumgroup.org.uk/533/838/large_thumbnail_smg00357634.jpg)
Great Western Railway Tank Indicator
1900
![](https://coimages.sciencemuseumgroup.org.uk/533/839/large_thumbnail_smg00357635.jpg)
Great Western Railway Signal Repeater
![](https://coimages.sciencemuseumgroup.org.uk/533/844/large_thumbnail_smg00357640.jpg)
Signalling Instrument, Solenoid Case
![](https://coimages.sciencemuseumgroup.org.uk/534/427/large_thumbnail_smg00358514.jpg)
Signalling Instrument, Solenoid Case
Tyers patent permissive slide release plunger
Block Release Switch
LNER signal arm indicator
1923-1948
Signal arm indicator, Southern Railway
1923-1948
Signalling instrument
Great Western Railway train describer
Dial train signalling instrument, 1844
1844
Signal arm indicator, Southern Railway
1923-1948