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Mon Feb 24 11:12:24 IST
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what is HOG  
7 Answers
Dec 16 2011 (17:15)
Coach Construction/Seating Arrangements

Entry# 872     
what is HOG

May 09 2019 (17:48)
Blog Post# 4312903-7     
Tourister^~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:08)
WDP-4B 40001 (now BGKT)
Having HOG ports

May 09 2019 (18:03)
Blog Post# 4312903-8     
Mumbaikar™^~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:08)
Nopes no WDP4D is/was HOG capable..only some WDP4B were capable enough...
Eg. 40084/40085 BGKT -> Regular links of HOG JP JU LHB ICE
Eg.40079 PRATEEK -> Now HOG ports taken off...

May 09 2019 (18:12)
Blog Post# 4312903-9     
Shaurya117^~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:09)
Only one experimental WDP-4D prototype is HOG fitted. Else only P7's and very few WDP-4B's are HOG capable.
Edit: After some research, I've found that experimental HOG WDP-4D prototype is TKD WDP-4D #40110

May 11 2019 (00:39)
Blog Post# 4312903-23     
CircarExpress~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:11)
HOG (Head-on generation) simply means that the electricity used for coaches (lighting, fans, A/C, pantry car cooking equipment etc) is generated by the locomotive. It is not related to electrification or OHE directly. In an electric loco, the power will come from the OHE. In a diesel loco, it will come from the diesel generator in the loco.
In an electric locomotive, since the electricity is supplied by the OHE, a locomotive having a HOG feature simply has some equipment in it which converts the power received from the OHE into something suitable for powering the coaches.
a diesel locomotive, the electricity is generated by the diesel generator (alternator). This electricity is normally used to run the traction motors and other equipment in the loco. But it is also possible to use part of this generated electricity to power the coaches. So, HOG diesel locos are the same as normal diesel locos, with just an additional option to use the electricity generated by the diesel generator for powering the coaches.

May 11 2019 (00:49)
Blog Post# 4312903-25     
CircarExpress~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:11)
I believe 4-5 WDP4B locos were given the HOG feature (40001 being one of them). But IR never took the HOG feature seriously in diesel locos. For electrified sections, using HOG locos will help save diesel. But on un-electrified sections, it doesn't really make a difference as both the loco and EOG use diesel only. The HOG for diesel locos wasn't a failure, rather it was just not useful in the way they were doing it.
Also, an E-loco can have a HOG feature without losing it's traction power. Since the power is drawn from the OHE, it can just draw the additional power from OHE while maintaining it's regular hauling power.
a diesel loco however, the power supply is limited ( it is only as much as the diesel generator can generate). So, if a HOG feature is to be given, then the tractive power will be reduced, making it difficult to haul heavy loads.
For example, if 500 HP is required for powering all the lights, fans A/C etc in a rake, and if HOG is to be used, then an e-loco and a d-loco will differ in the following way (using a WAP7 and a WDP4B as examples).
1) WAP7 - The WAP7 can get the additional HP directly from the OHE, by just having a higher capacity transformer. So, while a non-HOG WAP7 has 6350 HP for powering the traction motors and the other equipment in the loco, a HOG loco will still have the same 6350HP available for the loco and the additional 500 HP will be directly derived from the OHE.
2) WDP4B - The only source of power on a d-loco is the diesel generator, which has a limited capacity. So, in a 4500HP WDP4B, 500 HP will be used up for the HOG, leaving only 4000HP for the loco, reducing it's hauling capacity.

Rail Fanning
Jan 24 2014 (18:21)
Blog Post# 973875-0     
ɱεшศг รʄ εχ℘гεรร~   Added by: 16591🔸Hampi Express🔸16592^~  May 11 2019 (01:05)
AC &
HOG fitted EMD . TKD WDP-4D
#40110 with 12963 Mewar express
Location- RPZ
credit- ajay singh chouhan

Dec 16 2011 (17:08)
Blog Post# 304979-6     
Begins Falls Rises ™~   Added by: Harsh^~  Dec 16 2011 (17:15)
HOG means Head on Generator!!!
this is actually used in most emergency purposes!!! only a 3 phase loco can transfer the power from over head wires to the EOG's n to the coaches!!!
After extensive trials and improvements on the design, commercial service of HOG scheme involving one 3 phase electric loco and 12 passenger coaches & two power cars have been started from 21.02.2011 between New Delhi-Kalka & back in train no. 12005/’06 NDLS-KLK Shatabdi Express. In this scheme the power supply is received directly from locomotive through couplers and
DG sets kept off to be used during emergency only. The supply from locomotive is 750V, 3 phase.
No noise (DG sets will not be used)
• Saving of HSD oil (about 700 Ltrs per round trip)
• Economical (saving of about 18,000.00 per round trip)
• Pollution free environment at Rly. station etc. (No smoke as DG sets will not be used)
this isnt introduced everywhere as of now!!! wil take sometime to hit the tracks!!!!
mostly few WAP-7's n WAP-5's have this 3 phase system as of now!!!!
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