 In Siemens and EMD systems, the loco has been provided with 2 traction inverters (TCC-1 and TCC-2, for the respective bogies) while in the Medha system, it has 6 traction inverters, one for each traction motor.The final alterations to the GT46PAC came in the form of the WDP-4D.The locomotive is the most distinctively identifiable of the three thanks to the addition of a second cab at the hood end of the locomotive.