Section 187(2)(c) in The Dedicated Freight Corridor Railway General Rules, 2018
(c)after proceeding fifteen hundred meters from the location where "railway emergency call" was first heard if he does not sight any amber flashing light, or no hand signals are received, or "railway emergency call" is switched off, he may then resume authorised speed after confirming from the station master of the station ahead that all is well as far as his line is concerned.