KiwiRail says fuel is one of its Interislander service's largest operating costs. Photo / Samuel Rillstone, RNZKiwiRail says fuel is one of its Interislander service’s largest operating costs. Photo / Samuel Rillstone, RNZ

‘Completely standard’

Winston Peters. Photo / Mark MitchellWinston Peters. Photo / Mark Mitchell

International surcharges could cause ‘massive’ cost