The WAP-7 has been serving passengers for Indian Railways since their introduction in 1999. It is a passenger variant of the WAG-9 freight locomotive with a modified gear ratio to pull lighter loads at higher speeds. With an output of 6,125 hp, it is the most powerful passenger locomotive in the Indian Railways fleet, and the most numerous passenger locomotive in India.[peacockprose] The WAP-7 is capable of hauling 24 coach trains at speeds 110–140km/h (68–87mph). It also capable of hauling 26 coaches trains at speeds of 130 km/h.
In 2019, a variant of the WAP-7, designated the WAP-7HS, was introduced for higher speeds. The WAP-7HS has a max speed of 180km/h (110mph), and is capable of hauling a 24-car train at 160km/h (99mph) as opposed to the 140km/h (87mph) of the original. Indian Railways plans to use the WAP-7HS for Shatabdi, Rajdhani, and Duronto express trains. However, as of September 2022, it has not been confirmed if any others have been built, and the single completed WAP-7HS has stayed restricted to 130km/h (81mph).
Head-on Generation (HOG)
The HOG ports are equipped on right side upper and left side down on Erode based WAP-7 at White Field railway station
A main feature of Majority locomotives of this class is that they eliminate the need to have separate End on Generation (EOG) sets or DG (Diesel Generator) sets for supplying power to the train resulting in significant savings on maintenance and running costs. This technology, called HOG or "Head On Generation", transfers electric power from the loco's pantograph to the coaches instead of EOG where a power car equipped with diesel generator capable of generating adequate power of 3-phase 50Hz 415 V / 750 V AC (called 'head-end power') is provided at either end of the train rake to supply power.[4][5][6]
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