Section 242(2)(b) in The Dedicated Freight Corridor Railway General Rules, 2018
(b)when the train is not required to stop short of obstruction but proceed at restricted speed,- a speed 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 eight hundred meters from the place of the obstruction. In addition, Termination Indicators shall be provided at the place where a Loco pilot may resume the authorised speed; and