This section lists block instruments of types now becoming rare that are still in use on Britain's railway network. preserved railways are excluded from this listing.
| Instruments | Location | Remarks |
|---|---|---|
| Great Western Single Line Lock & Block | Ledbury Malvern Wells |
|
| Great Western Spagnoletti | Banbury South | Non-pegger only |
| Great Western 1947-style Permissive | Banbury North, Banbury South |
|
| Glasgow & South Western | Hurlford Mauchline New Cumnock Kirkconnel Thornhill, and Holywood |
|
| Great Central (MS&L) | Goxhill Pelham Street Stallingborough Woodhouse Junction |
|
| Great Northern | Pelham Street | |
| Harper's One-Wire Two-Position | None on Railtrack | Still in use in the Irish Rebublic
at: |
| Lancashire & Yorkshire | Blackpool North No1 Greetland Hebden Bridge Milner Royd Junction |
|
| London & North Western Absolute |
Arpley Junction Crewe Steel Works Croft Sidings and others? |
|
| London & North Western Permissive |
Salop Goods Junction (Crewe) | |
| Tyer "Black Box" | Woodhouse Junction Wrawby Junction and others? |
|
| Tyer No6 Tablet | Dunragit Glenwhilly Barrhill Girvan Seymour Junction* Elmton & Cresswell Junction* |
* - line is out of use |
| No "Line Clear Release" on section signals | Acton Canal Wharf Neasden Junction |
(Up only) |
There must be much more information to add here - contributions welcome!
Additional notes kindly provided by "Marcus", Roger Bell, Andy Boal, Lee Farrell and John Saxton