Loco Pilots of other zones / divisions are NOT trained to handle DC/AC Duel Voltage Type KYN WCAM2/2P/3 Engines. Hence, these locos do not venture on longer journeys! Also, in the olden days, when DC Traction was present in Mumbai Area, these DC/AC Locos were more needed here and hence they were not permitted to go out longer (in AC Traction - where WAPx/WAMx/WAGx can easily go)!