Page 191 - IRSEM_Main Book

Method A: This method shall apply to cases in which the line on which the train will run
when the points are set for isolation of the through line, is kept clear for the adequate
distance prescribed in Rule 3.40 of the Indian Railways (Open Lines) General Rules, 1976.

Method B: When a short dead end siding is provided, it shall not ordinarily be long enough
to permit of vehicles being stabled thereon. To obtain the adequate distance prescribed
under rule 3.40 of the General Rules the points of the dead end siding shall be set for the
across over and against the siding, before a train is admitted on a line trapped by this
method. Where it is necessary for the short dead end siding to be extended for the purpose
of stabling vehicles, the above rule shall apply, unless a trap is provided on the dead end
siding at a distance of not less than 180 meters (120 meters in case of stations provided with
multi aspect signalling) from the starter signal where provided or from points leading to the
main or through line. A train must be admitted on the running line unless the trap is set and
locked against vehicles occupying the further part of the dead end siding.

Method C: When a trap is used, a train must not be admitted on to the trapped line unless
the trap has been closed, so that the train will not be derailed if the driver over shoots the
trap.

(10) When Method A cannot be used, and for any reason it is not convenient to use Method
B or Method C and to provide adequate distance by setting the points of the short dead
end siding or trap for the cross over and against the siding or trap, a sand hump of
approved design should be used as a substitute for adequate distance as provided in
rule 3.40(4) of the Indian Railways (Open Lines) General Rules, 1976. In that case the
length of the siding should be at least one rail length and formation should be made up
for a short distance beyond the hump.

Chapter 7: Essentials Of Signalling Page 158 of 535