Alex Seal

Bristol Old Station Signal Box

Mechanical Locking Table

George Pryer Diagram

Chris Bellett

Produced by Chris Bellett, checked by Nick Perring and Trevor Hodgson.

No. Released By Locks In Normal Position Locks In Either Position Releases
1 (2N.MSL). 10.25.27. 11.  
2   10.25.27 11.  
3 9.(4N.5N.6N.MSL). 5.16.17.(18w12R).23.(25w10R).26. 10.12.  
4 9.10. 25.26. 11.  
5 9.(16 OR 17). 3. 24. 16.  
6 9.12. 18.23. 13.  
7 15. (19N.20N.MSL) 12.14.18.22. 13.  
8 X      
9     10.12. 3.4.5.6.
10   1.2.12.16.17.27.   4.26.
11     10. 25.26.27.
12   7.10.14.16.17.19.22   6.23.
13     12. 18.22.23
14   7.12.16.18.19.22.   20.28.
15     14. 7.19.20.
16   3.10.12.14.17   24.
17   3.10.12.16   5.24
18 13 (3w12R).6.7.14.19.22.23 (9w12R).12.  
19 15. 12.14.18.22. 13.  
20 14.15. 28.    
21 X      
22 13. 7.12.14.18.19. 15.  
23 12.13. 3.6.18. 9.  
24 (16 OR 17). 5. 9.  
25 11. 1. 2. (3 w 10R). 4. 26. 27. 10. (9w10R).  
26 10.11. 3.4.25    
27 11. 1.2.10.25.    
28 14. 20. 15.  

Signalling Record Society

Things you wouldn't have expected...

  1. 2 released by 11.
  2. Possible to accept on Platform 12 Line with route set into No.2 Siding.
  3. 19 released by 13.
No. Released By Locks In Normal Position Locks In Either Position
1   10.25.27.  
2 11. 10.25.27  
3 9. 16.17.23.26.(18w12R).(25w10R)  
4 9.10. 25.26.  
5 9. (16 OR 17). 24.  
6 9.12. 18.23.  
7 15. 18.22.28.  
8 X    
9     10.12.16.17.
10   1.2.12.16.17.27.  
11     10.
12   10.14.15.16.17.22.  
13     12.
14   12.16.18.19.22.  
15   12. 14.
16   3.10.12.14.17.  
17   3.10.12.16.  
18 13 6.7.14.19.22.23.(3w12R)  
19 13.15. 14.18.22.  
20 14.15. 28.  
21 X    
22 13. 7.12.14.18.19.  
23 12.13. 3.6.18.  
24 (16 OR 17). 5.  
25 11. 1.2.4.26.27.(3w10R).  
26 10.11. 3.4.25.  
27 11. 1.2.10.25.  
28 14. 7.20.  

H.T. 3 BAR 5 1/4" CTRS.
DRAWN : 9.1951 - ISSUED : 19. 1. 1954

LOCKS (N) : 22.23.26.27.
  (N) WITH LCC : 10
  (R) WITH LCC    
  & RD CONTACT : 9.11.13.15.
CONTACTS 2 SPRING (N) : 10.12
    (R) : 1.3.7.14
  4 SPRING (2N 2R) : 19.20.
  6 SPRING (4N 2R) : 26.27
    (2N 2RA) : 4
  8 SPRING (4N 4R) : 25

Signalling Record Society