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At
stations situated in localities where fog, or dust storms or heavy rains are
generally prevalent, a visibility test post painted alternately black and
yellow shall be provided at a distance of 180mts from the centre of SM’s office
and illuminated during night, the VTO shall be specified in the station working
rules and it may be a semaphore arm by day or a light or back light of
semaphore signal by night or a light of a colour light signal both by day and
night.
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Before
granting Line clear SM shall ensure the VTO is visible, when the VTO is not
visible, SM to advice station in rear to issue Caution order and arrange for
fog signaling.
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SM
shall depute two trained Fog signalmen with 10 detonators each on either end of
the station limits.
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A
fog signal post painted alternately black and white is erected at a distance of
270 mts from the outer most stop signal and fog signal man shall place two
detonators 10 mts apart at the post and he shall withdraw beyond the safety
radius of 45 mts from the detonators before they are exploded by an approaching
engine or train.
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Should
the Fog signalman be aware of any obstruction on the line, he shall show a stop
hand signal to any train approaching. On single line sections the fog signal
man shall exhibit PHS to the trains leaving the station and no signals shall be
shown towards approaching trains.
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When
the engine explodes 2 detonators, it warns the Loco Pilot of his proximity of FSS
of the station. The LP shall look out for the aspect of the signal and stop at
the FSS and further proceed at a speed not exceeding 10 kmph. The fog signal
man shall after passage of the train shall replace the detonators.
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In
case of dense fog prevailing in the section the maximum speed of trains is to
be restricted to 60 kmph in the absolute block system.
