Isolation,Trap

 1)The line on which speed is higher than 50 kmph should be isolated from all other running lines.

2) Passenger lines should be isolated from all other goods line and siding, irrespective of  speed.

In any other case Isolation may be desirable but not compulsory.

3) If speed is less than 50 kmph, Passenger line is not required to be isolated from passenger line

4) Catch and Slip Sidings and sidings provided for isolation purpose only.

Means of Isolation 

1) Sand humps, trap points or other approved means of Isolation shall be provided on all goods lines and sidings at the junctions with passenger lines, the normal setting being such as to prevent the passenger lines from being fouled.

2) At Interlocked layouts, means of Isolation shall be Interlocked with the relevant signals.

3) No trap point in Main line /Through line.Trap point can be placed in main line with permission of CRS ( under approved special instructions)

4) Sand hump is must after every four station. 

If Sufficient distance  is not available ahead of starter signal to provide signal overlap of 120 m,then a trap point is placed ahead of starter to achieve signal overlap

Trap indicator 

Trap indicator shall be provided at all trap points on running lines which are not Interlocked with signals, unless the potision of trap points is otherwise proved.Trap indicator shall be of the target type.

Detailing Switch 

Points leading to a short dead end and used solely for the purpose of trapping the running line or siding shall be treated as derailing Switch.

Indications

a) When the trap points or derailing lines are open, the indicator shall display a red target by day and Red light by night in each direction.

b) When the trap points or derailing lines are closed, the indicator shall display edge of the disc by day and a green light by night.Red light may also be permitted to indicate trap Closed position only.



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