Indicators

Basic Concepts of Signalling Indicators and Markers

Indicators and Markers • Indicators and Markers are provided on certain signals or points to provide extra information to the Drivers.

Semaphore Signals

For Goods Running Lines

For Dock Platform Lines

For Signals not in use

Semaphore Signals

G

Markers on CL Signal Posts

C

A A

P Semi Auto Signal

Auto Signal

Calling On Signal

Permissive Signal

IB

R

Repeating Signal

Intermediate Block Signal

Markers on CL Signal Posts

G

Gate Signal

A

G

Gate Signal in Auto Territory

A

AG

Gate Signal in Semi Auto Territory when interlocked with Points also

Point Indicators • Point indicators are appliances fitted to points to indicate the position in which the points are set. They show a white target (during day) or a white light (during night) in both directions when points are set for straight and no target or green light when set for turnout.

Trap Indicators • Trap indicators are appliances fitted to Trap points to indicate the position in which they are set. They show a red target (during day) or a red light (during night) in both directions when trap points are open and no target or green light when trap points are closed.

Route Indicators • A common signal with route indicator is provided in lieu of separate signals on a bracketted post or a gantry. • A Route indicator may be of : – Stencil type – multi-lamp type – junction type

Used for speeds upto 25 kmph For speed > 25 kmph