Welcome to Chennai central. in this Video you will see an awesome Head on Generation or in short HOG coupling sequnce of a WAP7 Electric Locomotive with AC Double decker coaches & closely followed by Loco shutdown & startup and crew inspection before departure. Our train today is the Bangalore bound AC DD, 22625.

I will now take you to the locomotive, the scene of action but before that let me give some information on HOG or Head On Generation. Air-conditionined coaches & LHB coaches require 3 phase electric supply for the coaches. This is currently provided by the EOG or End On Generator Cars, one each in the front & rear of trains. The issue is that the generators run on diesel whic is expensive and Railways want to save fuel cost.

Location : Chennai Central, Train # 22625 - Chennai Central - Bangalore City AC Double Decker

Locomotive : WAP7, 30575, RPM, Medha Hotel Load equipped.

HOG is a system where the Electric locomotive provides this 3 phase supply through a hotel winding of the OHE, overhead transformer which feeds the two 500kva static converters and convert single phase into 750V three phase supply & supply it through two IV couplers.
Do you know the Benefits of HOG System?. Read this and watch this awesome video. With more and more WAP7's available with Hotel Load ( HOG ) support lots of trains with LHB coaches are being shifted to HOG power rather than the EOG provided power.
HOG is a system where the Electric locomotive provides this 3 phase supply through a hotel winding of the OHE, overhead transformer which feeds the two 500kva static converters and convert single phase into 750V three phase supply & supply it through two IV couplers to the coaches.

In regular practice, 2 nos. of power car equipped with Diesel Alternator (DA) sets placed at either ends of the rake run with every Shatabdi Express. After provision of hotel load converter i.e. HOGs system, there is need of only one power car to be attached with the shatabdi train rake for standby purpose (to use the DA set supply only after failure of HOG supply) only. Another power car can be removed as there is no need of the same with HOG system one power car can take whole load of the shatabdi rake in emergency due to failure of HOG supply system. Meanwhile, one extra passenger coach in place of removed power car can be attached without increasing in train length.

Increase in revenue and reduction in operational cost: The average cost of one loco sets hotel load converter is Rs. 120 Lacs only.The revenue earned through ONE additional AC Chair Car is nearly 4 times the cost of the HOG equipment. In view of this, revenue of IR will be increased by operating more and more LHB based fully AC trains like Shatabdi, Rajdhani and Duronto Express. (ii) Pollution free: In EOG system, there are two types of pollutions - (i) Air pollution due to burn of High Speed Diesel, and (ii) Noise pollution by DA sets whereas HOG system is totally free from both types of pollutions i.e. air and noise pollutions. (iii) Carbon Credits: Carbon credits can be earned by not emitting the carbon dioxide through burning of high speed diesel into the environment. IR can also sell this carbon credits in international markets. (iv) Better reliability due to reduced number of generating equipment, low maintenance requirement, reduced dead weight as compared to SG and EOG system

HOG will help in saving fuel cost by removing EOG cars and add additional coaches in place of them.It is a GO Green initiative.