SWR is using SCR links coz SWR doesn't have a E-Loco shed till now, but now KJM is being setup n also will be homing good no.of P7s, when SWR was using P7s in return it even provided it's WDP4D's to SCR, which played a crucial part till date. So there is nothing as such as exploitation. Ultimately they are IRs locos whether serve SCR or SWR or some other zone, we need to happy for the same.