1. RAILWAY INDUSTRY TRAIN PLANNING LEVEL 2 TRAINING Module 3 – Signalling Principles

2. Signalling and Planning Headways The provision of signals determine the minimum interval between (a) subsequent trains on the same line and (b) between conflicting trains at a junction. As planners we increase the minimum time so that we plan for following trains to run on ‘green’ signals – the Planning Headway

3. Signalling Terminology - 1 Types of Signals Block Section Track Circuit Block Absolute Block

4. Semaphore Distant Signal

5. Semaphore Stop Signal

6. Semaphore Subsidiary Signal

7. Semaphore Shunting Signal

9. 3 Aspect Colour Light Signalling

10. 4 Aspect Colour Light Signalling

11. Junction Indicators

12. Llandudno Jn

13. Position Light Signals

14. Gobowen North

15. R R R

17. Signalling Terminology - 2 Permissive Working Single Lines Bi-directional Lines SIMBIDS (Simplified Bi-directional Signalling) Single Line Working

18. Permissive Working

19. Up Relief Down Relief Up Main Down Main R128 R28 790 791 R328 Up Down a 788 b R57 R522 R134 a 787 b a 786 b a 784 b R51 R53 R253 798 800 R332 R381 R383 Platform 4A Platform 4B a 776 b 777 R49 a 772 b a 771 b a 785 b R530 R571 R526 R534 a 781 b R255 R567 R153 R151 773a 773b a 775 b 779 780 R561 Down Main Up Main (Through) Dn Rlf Up Rlf Up Southern Down Southern Up Goods Down Goods Platform 10 Platform 9 Platform 8 Platform 6 Platform 5 Platform 4 Pilot Line No 6 Goods (Motorail) R524 LOS R577 T R36 R251 Reading East

20. Abbey Foregate