In 1985 the network was electrified with a 25 kV overhead traction system. The network has been extended on several occasions as more mines come online. Two recent new mines were not initially electrified. These are Rolleston and Minerva Mines. The cost involved for the electrification of these two mines was considered too high as they are a considerable distance to join onto the current electrified network. However the electrification of the rail to Rolleston Mine was completed in December 2014. The rail to Minerva Mine is not electrified.