1. HOG - Also called Head-on Generation. In this case, the power from the OHE is directly used to supply power to the coaches with suitable stepping down of the OHE voltage. Traditionally, a pantograph is provided on a power car coach for that purpose. As our Indian OHE cannot support high speed with multiple pantographs, this facility is provided in locomotives. Very high efficiency.
EOG - End-on Generation. Two power cars at each end have DG (diesel generator) sets in which the thermal energy generated by the combustion of fossil fuel (diesel) is utilised to generate electricity. Although it pollutes the surroundings by the emission of smoke, its efficiency is considerably higher than that of self generation.
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2. WAP7 : Co-Co three phase passenger locomotive. Continuous power at wheel rims is 6120 HP (some sources say 6000 HP) in 71-140 km/h range. Maximum is said to be 6350?? (Only IRFCA mentions this value). A moderate speed high power loco which happens to be a re-geared version of WAG9. Design speed is 140 km/h and operated up to to 130 km/h.
WAP4 : Co-Co conventional (tap changing) passenger locomotive. Continuous power at wheel rims is 5060 HP (some sources say 5000 HP). CLW was manufacturing them from early 90's till December 2015. Max speed is 140 km/h (same as WAP7).
WAP5 : Bo-Bo three phase high speed passenger locomotive. Maximum power is 6000 HP according to IRFCA, continuous power at wheel rims is 5440 HP (some sources mention 5500 HP). Two variants are available - gear ratio of 67:35:17 for 160 km/h (max 180 km/h) & gear ratio of 59:35:19 for 200 km/h (max 225 km/h). First 3-phase locomotive in India and first 10 were imported from ABB/AdTranz unit in Switzerland and one (# 30008) was received in kit form (sorry IRFCA, you got this one wrong). No loco got damaged in any fire accident 😝😝