the Perisher Ski Resort, it connects the main entrance of this tourist destination with ski areas that are inaccessible via road. The line mainly operates underground. The Byron Bay Train service operates as a shuttle between Byron Bay station in the Byron Bay township and North Beach station. The privately run service operates on a 3 km section of the disused Murwillimbah line. Private railways Cane Tramways with gauge for the transport of sugarcane have always been operated as private concerns associated with the relevant sugar cane mill. These tramways are quite advanced technically, with hand-me-down rails cascaded from the normal rails, remote-controlled brake vans, concrete sleepers in places, and tamping machines in miniature. The twenty or so separate tramways cooperate in research and development. Timber Tramways were often associated with the transport of timber to sawmills. Various gauges were used, including the gauge, which was also commonly used for cane haulage. Wider gauges were sometimes used as well; Queensland had a number of 991 mm (3 ft 3 in) systems, some on wooden rails. In some areas was used, a considerable investment of resources. In the early 21st century, the disused Queensland Rail line to Esk in the Brisbane Valley was used for timber haulage. Iron ore Five isolated heavy duty railways for the cartage of iron ore in the Pilbara region of Western Australia have always been private concerns operated as part of the production line between mine and port, initially commencing in 1966 with Goldsworthy Mining Associates' Goldsworthy railway, and recently in 2008 with Fortescue Metals Group's Fortescue railway and in 2015 with Roy Hill Holdings' Roy Hill railway. These lines are continually optimising axle loads (currently the heaviest in the world) and train lengths, that have pushed the limit of the wheel to rail interface and led to much useful research of value to railways worldwide. An open access sixth standard gauge iron ore network was proposed to the Oakajee Port in the Mid-West region to the south of the Pilbara but the project is currently on hold pending a viable business case. High-speed rail Medium-speed passenger services Several medium-speed rail services operate on existing track that has been upgraded to accommodate faster services and/or tilting technology. Some of these services use high-speed capable rolling stock. In Western Australia, Westrail began using high-speed diesel railcars in 1971 on The Prospector service from Perth to Kalgoolie, and