As the load carrying capacity of the existing roads was constrained by bridges at Henley (on State Highway 1) and Beaumont on State Highway 8) it was decided that as the Waikaka Branch railway line had no constricting tunnels it would be used to transport out of gauge heavy items such as the turbine runners and bottom bearing brackets. These items were transported on the Main South Line from the port at Bluff to the junction at McNab and then via the Waikaka branch line to its terminus at Waikaka. From there they were transported by road to the power station using a specialized transporter. This assist in the transfer from rail to road transport a 4-pole 30 ton (30.5 tonne) gantry was erected at the Waikaka railway station.