(1) when line clear has been granted to a train and when -
(a) approach signals have not been taken 'OFF', no obstruction shall be permitted outside the outermost points or BSLB but Shunting within station section may go on continuously provided the necessary signals are kept at 'ON' and shunting is permitted under special instruction which takes into consideration the speed, weight, and brake power of the trains, the gradients, the position of the first Stop signal and the distance from which that signal can be seen by the Loco pilot of an approaching train.
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(b) approach signals have been taken ‘OFF’ for incoming train, shunting movement shall only be permitted on lines which are isolated from the path of incoming train under the supervision of competent railway servant
(2) When line clear has not been granted to a train.- Shunting within station section may go on continuously provided the necessary signals are kept at 'ON' .