In Wellington, there is an gap from Waikanae to the central NIMT electrification at Palmerston North. Since the extension of electrification to Waikanae in February 2012, there have been calls for the electrification to be extended by to Otaki. If this happens, there will be a gap. As the two electrification systems are different, multi-current locomotives or multiple units would be required for through electric working, should that gap be ever closed, unless one electric system is converted to be consistent with the other.