Section 199(4) in The Dedicated Freight Corridor Railway General Rules, 2018
(4)When the locomotive is pushing the material or departmental train the supervisor incharge or a competent railway servant deputed by him shall exhibit hand signals to the loco pilot continuously from the leading vehicle fitted with air brake valve or hand brake, the speed of train shall be restricted to twenty five kilometre per hour, and when such a leading vehicle is not available the speed shall be further restricted to ten kilometre per hour and loco pilot shall be hand signalled.Provided further that in case only one or two vehicles are in front of the locomotive as in case of patrol special a maximum speed of forty kilometre per hour may be permitted during run.
