![](https://coimages.sciencemuseumgroup.org.uk/425/877/large_thumbnail_1994_8783__0010_.jpg)
Telegraph block instrument
![Telegraph block instrument](https://coimages.sciencemuseumgroup.org.uk/534/466/small_thumbnail_smg00358658.jpg)
![Telegraph block instrument, Sykes release indicator](https://coimages.sciencemuseumgroup.org.uk/425/826/small_thumbnail_1995_7109__0002_.jpg)
![Telegraph block instrument, Sykes release indicator](https://coimages.sciencemuseumgroup.org.uk/425/829/small_thumbnail_1995_7109__0006_.jpg)
![Telegraph block instrument, Sykes release indicator](https://coimages.sciencemuseumgroup.org.uk/425/828/small_thumbnail_1995_7109__0003_.jpg)
![Telegraph block instrument, Sykes release indicator](https://coimages.sciencemuseumgroup.org.uk/425/798/small_thumbnail_1995_7109__0007_.jpg)
Telegraph block instrument, Sykes release indicator, "34. And Up Branch Plunger"
Details
- Category:
- Signalling & Telecommunications
- Object Number:
- 1995-7109
- type:
- block instrument
- credit:
- British Rail, Clapham
Telegraph block instrument, Sykes release indicator, "34. And Up Branch Plunger"