 there is currently a total of 96 vehicles with mileages above a maintenance event mileage threshold all are within a controlled management regime there is 1 vehicle stood down awaiting heavy maintenancethere are 16 vehicles with temporary mileage extensions to allow ongoing service operation at the customer s request appropriate technical and operational controls are in place to manage these temporary extensionsthere are 79 vehicles under controlled mileage extensions as part of maintenance lifecycle optimisation work 