On 13 August 2019, the railway announced that it had ordered two new battery-diesel hybrid locomotives from Clayton Equipment Ltd for introduction at the start of the railway's 2020 season. The intention is that the diesel generator on the new locomotives will be switched off on the downhill runs, with regenerative service braking used to recharge the battery to provide power for the next ascent. This method of operation means that the locomotives' engines, which will comply with EU Stage V emission standards, can be less powerful than those on the existing locomotives, thus providing maintenance and fuel savings, quieter operation, and lower emissions.