(a) a motor trolley shall ordinarily be run either on line clear as a signalled movement as in case of a train or under block protection or during corridor maintenance block;
(b) A motor trolley can be permitted to follow a train on motor trolley permit in Form19 cautiously maintaining a safe distance at least four hundred meters and be prepared to stop short of a stopping train;
Provided the block section will be closed only after arrival of the trolley or trollies either at the origin or next station or lifted off the track in mid-section as confirmed by trolley in charge on secured voice communication.
(c) the trolley following a train shall be handed over the trolley permit which should be deposited with the Station Master of block station in advance or in the rear depending upon where its journey is ended; and
(d) more than one motor trolley can follow a train or each other. When more than one motor trollies are running together in the same direction, sufficient distance of more than one hundred meters shall be kept between them, and when they are following a train the trolley permit in Form19 shall be carried by the rear most motor trolley.
286 THE GAZETTE OF INDIA : EXTRAORDINARY [PART II—SEC. 3(i)]