FURTHER TO THE 40 tonne locomotive driveline upgrade paper presented at the 2017 ASSCT conference, the new locomotive driveline has now been in operation for one crushing season at Invicta Mill in north Queensland. This paper presents the experiences and performance of the upgrade and discusses some of the enhancements to the prototype design for inclusion with future upgrades. Predicted fuel savings of 33% have been achieved. The current average fuel burn across all Wilmar 40 tonne locomotives is currently 36 L/h and the Piralko locomotive with the driveline upgrade is averaging 24 L/h. Once commissioned the locomotive did not require any additional maintenance work other than routine servicing. The locomotive driver comments have been most encouraging regarding reduced noise and vibration in the operator cab. Other operability factors that have been acknowledged by the drivers are that the tractive effort from stand-still is improved and that the overall control of the train is improved. The cooling package has performed well, as evidenced by the maximum engine temperature just reaching the full open thermostat setting in data logs with average ambient summer temperature conditions for the Burdekin district. Several upgrades have been incorporated into the prototype transmission design to improve operations, maintenance and reliability. A detailed description of these improvements is included in this paper. Now that the Piralko locomotive has provided the necessary platform to satisfy the requirements of a robust sugar industry driveline upgrade package, further Wilmar Sugar locomotives are currently being upgraded. These locomotives are the Hodel (73 Class) at Invicta Mill, the Jardine (DH Class) at Pioneer Mill, Loco 11 (DH Class) at Proserpine Mill and the Carmilla (73 Class) at Plane Creek Mill. At the end of the upgrade program it is intended that 25 Wilmar Sugar locomotives will be fitted with this driveline upgrade package.