Sir, take the case of ERS Locos... most of them hauling in KR region...
Similarly
TVC Raj with GOC WDP3A.
KSK with GOC DP3A
KCVL DDN express with RTM WDM3A( Despite being a SR train)...
more...
My question is when ERS is having a Loco shed, Y other division locos hauling them? If Locos are meant for hauling trains in a particular area only?