What i do feel that to propel acceleration & MPS, after negotiating Dynamo Friction (as in ICF Coach/Rake), Diesel Loco would b burning more fuel as compared to Loco+EOG Fuel consumption in case of LHB!!!
Non-LHB ICF Rakes of Raj/Shatabdi/DRNTO wernt self generating but getting it via EOG only!!
If its E-Loco, then also more electric consumption somewhere means more burning of Coal (still we more into Thermal mode of Elec production)!!