Section 242(2)(a) in The Dedicated Freight Corridor Railway General Rules, 2018
(a)when the trains have to stop dead short of obstruction and only then proceed cautiously, - a Stop Indicator shall be exhibited at a distance of thirty meters from the place of obstruction and a Caution Indicator shall be placed at a distance of twelve hundred meters from the place of the obstruction. In addition, Termination Indicator shall be provided at the place where a Loco pilot may resume the authorised speed. A railway servant shall be deputed at the Stop indicator board to obtain the signature of the Loco pilot;