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

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

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

Semaphore Distant Signal

Semaphore Stop Signal

Semaphore Subsidiary Signal

Semaphore Shunting Signal

3 Aspect Colour Light Signalling

4 Aspect Colour Light Signalling

Junction Indicators

Llandudno Jn

Position Light Signals

Gobowen North

R R R

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

Permissive Working

Up Relief Down Relief Up Main Down Main R128 R R328 Up Down a 788 b R57 R522 R134 a 787 b a 786 b a 784 b R51 R53 R 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 R a 773b a 775 b 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

Abbey Foregate