Information and Usefulness of
Visibility Test Target (VTO)
1. A 'Visibility Test Object'
will be used to determine the onset of fog. Visibility Test Object (VTO) of the
station is defined in all Station Working Rules (SWR). All Operating staff must
be aware of this
2- Except in those stations
where a special signal or signal arm or light or tail light has been marked as
the visibility test target under the Station Working Rules, Additionally,
visibility test posts are installed at all stations as Visibility Test Object.
3. Visibility Test Object will be a post made of steel/iron/wooden sleeper with black and yellow slanted stripes which will be illuminated at night and will be visible from both sides of the station and between the station master's office where the SM stands. It is planted at a distance of 180 meters.
4. In case of dense fog or stormy weather impairing visibility or during a dust storm when the Visibility Test Object is not visible, the Station Master on duty shall personally ensure that the signal lights of the station are lit and then he The trained man will send one man in each direction to act as fog signalman at the fog signal post which is installed at a distance of 270 meters from the first stop signal.
4- If after giving line clear to the previous station the Station Master finds that he is unable to see the visibility test target, he will take immediate steps to set off the detonators.
5- As soon as the visibility test target becomes visible again, the above process of setting detonators will be stopped.
6- The Section Controller and the Station Master on both sides will be informed about the activation and cancellation of the above method.
7- The following information must be recorded in the diary of the station master.
(a) The time when the VTO is not visible.
(b) The time when the working Section Controller and the working Station Master at both ends were informed about the weather of dense fog and mist.
(c) the time at which the said operation was cancelled.
(d) Any such information as may be necessary.
