(1) Fixed signals shall not be brought into use until they have been inspected in the manner prescribed under special instructions and duly sanctioned by the competent authority appointed in this behalf by the railway administration.
(2) After a new signal has been brought into use or shifted, caution order shall be issued for a period of seven days for drawing the attention of the loco pilots.
(3) A warning board shall be provided at a distance of one thousand four hundred meters in rear of the first stop signal. The warning board is an indication to the loco pilot when he is approaching the first stop signal of a station. It shall have a circle between two horizontal or parallel lines and painted yellow on a black board of distinctive design.
Provided that warning board need not, be provided where the first stop signal is preceded by more than one distant signals.
B - Care of signalling equipment