RAILWAY INDUSTRY

TRAIN PLANNING

LEVEL 2 TRAININGModule 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

R28790

791

R328

Up

Down

a 788 b

R57

R522

R134

a 787 b

a 786 b

a 784

b

R51

R53

R253

798

800R332

R381

R383

Platform 4APlatform 4B

a 776 b 777

R49

a 772 b

a 771 b

a 785 bR530

R571

R526

R534

a 781 b

R255

R567

R153

R151

773a773b

a 775 b

779 780

R561

Down Main

Up Main (Through)

Dn Rlf

Up Rlf

Up SouthernDown Southern

Up Goods

Down Goods

Platform 10Platform 9

Platform 8Platform 6

Platform 5

Platform 4

Pilot Line

No 6 Goods (Motorail)

R524

LOS

R577

TR36

R251

Reading East

Abbey Foregate