Aerodynamics is not an issue with these locomotives. :)
For a locomotive hauling a train, the wind hitting from front is not a problem until the train attains high speeds (almost 180-200 kmph). And for most of the time, the cross winds (wind blowing under the coach, between the coaches) and the track resistance are more critical for speed. Even EMD's do not have a special aero-dynamic design. while the short hood side in EMDs has a cab with rounded features, it only offers a very small reduction in the air resistance, and on the whole, does not make any difference to the acceleration or top speed of the loco. When running in LHF mode, even EMD's do not have...
more... an 'aerodynamic' front, but they are equally capable of 160 kmph in both LHF and SHF. The restriction to 110-120 in LHF mode is only because of visibility problems for the LPs in LHF mode.
Air resistance plays a very negligible part in the acceleration of IR's locomotives. While the WAP1/4/5/7 have a 'V' shaped nose, for the speeds at which these run, this really does not affect the resistance much. And the air resistance at the front is not strong enough to reduce the acceleration of the locomotive.
11121 ( ED EDM3D) had an EMD style cab as IR was trying to mimic the EMD style control stand and electronics in the WDM3D. This was an experiment at improving the visibility for LPs in the short hood and provide a modernized control stand. This had nothing to do with aerodynamics or MPS increase.