Warning Board,G Marker,Detonator

 A warning board is to warn loco- pilot approaching a stop signal of a station.It is provided at a distance of 1.4 km in rear of the FSS.

Where inter distance between two signals is less than the distance required for warning board, the signals in rear shall either be controlled by the signal in advance or both the signals shall be combined.

Generally placed on left side unless there are special reasons to the contrary.

Goods Warning Board -

Height of centre of circle of  goods warning board is 3.65 m from Rail level.The dimension of rectangular board is 1800× 530 mm.In Double distant terroritary, there is no need of this board. It gives a pre warning that either FSS  of a Station or IBS or Gate Stop Signal will come after 1400 m.This distance may be increased suitably to cater for gradients.Its post is alternate yellow and black.

Detonator-

When engine explodes detonator, Loco pilot shall whistle intermittently and take every possible caution including reduction of speed as necessary,so as to have the Train well under control and be able to stop short of any obstruction on the  line.

After passing 1.5 kms from the place where the engine exploded detonator,if his engine does not explode any more detonator, the Loco Pilot can resume Authorized speed and he should report the incident to the next station.

Indication Board-

Indication Boards are provided to give warning to loco pilot about changes in the type of Signalling or type of block working or automatic protection territory.

Important points -

1) An Indication board shall be provided at the foot of Gate Signal if it is protecting more than one mid section LC gate with appropriate legend.

2) An Indication board shall be provided at foot of the IB Signal if it is protecting mid section LC gate with legend  Look out for LC Gate when passing IB at ON.

3) A board shall be fixed not less than 400m in advance of IBS Signal facing against the direction of traffic,to read "No backing without Permission  ( GR -8.7.0)"

4) When the block working at one end of a Station is automatic and the other end is absolute, an indication board with suitable legend shall be provided at first stop signal of the Station. The legend on the board shall be Entering  Absolute  Block Territory or Entering Automatic Block Territory. 

Point Indicator ( for Non Interlocked points)

They are provided at all points on the running lines which are not Interlocked with signals, unless position of points is otherwise proved.

Point indicator shall be of Target type.

1) When the point is set for straight line, the indicator shall display a white target by day and white light by night in each direction.

2) When point is set for diverging line, the indicator shall display the edge of the disc in the day and a green light by night in each direction.

3) At points where a green light would give a misleading indication to a loco pilot, a red light may be permitted under special instructions.


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