Subsidiary Shunt Signals

Railway Signalling a Track Layout

Railway Signalling a Track Layout

Railway Signalling a Track Layout

  • Base Information
  • Signals at Stations
  • Signals at Loops
  • Simple Trailing Junction
  • Trapping Protection
  • Double Junction
  • Left-hand double running junction
  • Subsidiary Signals
  • Signalling at Terminal Station

Base information

  • Base Information
  • Signals at Stations
  • Signals at Loops
  • Simple Trailing Junction
  • Trapping Protection
  • Double Junction
  • Left-hand double running junction
  • Subsidiary Signals
  • Signalling at Terminal Station

Civil Engineering Features (List is not exhaustive)

  • Main Route lines
  • Gradient Posts
  • Mile posts
  • Permissible Speed
  • Accurate position of S&C (Drawn in their Normal Lie)
  • Viaducts and Tunnels (with lengths)
  • Stations and platforms
  • Level crossings
  • Bridges
  • Site access points

Other Features

  • Traction substations/huts
  • Limit and type of electrification
  • Mile posts
  • Characteristics of the trains running on the line (Braking/Acceleration etc)

Signals on Plain line

Signals on Plain line

Signals at Stations

  • In the common situation where there is point work immediately beyond a station platform, then a signal should be placed at the departure end of the platform.
  • Platform departure signals would be required at both ends of the platform despite the line itself being apparently uni-directional. This is to facilitate reversing trains.

 

Signals at Stations

 

Signals and Overlaps

105 – 107  Points not required

205 – 207  requires Points Normal

Signals and Overlaps

 

Signals Beyond Junctions

Signals Beyond Junctions

Signals at trailing points

Signals at trailing points

 

 

 

Signals at trailing points 1

TRAP POINTS

TRAP POINTS

 

Signals on Loops

Signals on Loops

1. parallel signals 17 & 19 at the end of the loop

2.excessive distance from the facing points

3.causes unnecessary delay in normal working for

trains entering the loop and is particularly inconvenient

when operating in degraded mode when a failure

prevents 13 from being cleared.

 

Signals on Loops

 

1.Parallel signals 27 & 29 at the end of the loop

2.Underbraking of signals 25 and 29. additional Controls are required.

Signals on Loops 2

 

1.May Solve 800m Problem and Underbraking problem

2.Signals are not parallel, Misinterpretation Problem may arise.

Signals on Loops

It is important therefore to appreciate that there is no one option that is always best;

it is a matter of compromise between different, and often conflicting, considerations. This indeed is the skill of the designer;

for any one particular case one of the options is likely to be clearly preferable, another acceptable but sub-optimal and the remaining one distinctly unsuitable if not completely unacceptable.

Terminal Station

Terminal Station

Subsidiary/Shunt Signals (Position Light Signals)

Subsidiary Shunt Signals

 

Signalling at Yards – 2

Signalling at Yards

Signalling at Yards – 3

 

Signalling at Yards
Double Junction

Double junction is a railway junction where a double track railway splits into two double-track lines. Usually, one line is the main line and carries traffic through the junction at normal speed, while the other track is a branch line that carries traffic through the junction at reduced speed.

Left Hand Double Junction

 

Left Hand Double Junction

 

Switch Diamond

Switch Diamond

Signals just beyond Junctions

There are no such hard and fast rule but wherever possible a signal should not be placed closer than MRD to the junction.

Signals just beyond Junctions

 

Passable/Non Passable Signals

Passable/Non Passable Signals

Railway Signalling a Track Layout,Base information, Signals on Plain line,Signals at Stations,Signals and Overlaps,Signals Beyond Junctions,Signals at trailing points,TRAP POINTS,Signals on Loops,Terminal Station,Subsidiary/Shunt Signals (Position Light Signals),Signalling at Yards – 2,Signalling at Yards – 3,Double Junction,Left Hand Double Junction, Signals just beyond Junctions,Passable/Non Passable Signals

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