Can somebody post a picture of a fuel refilling process by a locomotive at railway stations?Usually how much time does it take to fill up the tanks fully of a diesel engine?

18320 gets it's thirst quenched at this refilling point at Ernakulam Jn.
Courtesy: Jimmy Jose

usually none of the two options are used sirjee, IOCL tanks usually have fuel farms beside stations from where fuel lines are laid to end of platforms or specific refueling points, usually fuel is only dispensed from here being piped from open air/underground tanks at the fuel farm..
drums are not used for refueling afaik..