and bogie centre pins have to be disconnected before the vehicle is lifted and new bogies are wheeled underneath. In Europe, a similar principle embodies low-profile, small-wheeled transporter wagons, which carry vehicles built for one gauge on a line with a different gauge. A variant is the rollbock (Rollböcke in German), used under two-axle standard-gauge vehicles: each wheelset is carried on a small four-wheeled narrow-gauge trolley. The entire train is converted in minutes at a slow walking pace, each rollbock being automatically matched to its wheelset from underneath. A further variant is "train on train", in which an entire narrow-gauge train is carried on standard-gauge flatcars on which continuous rail has been fitted. Differences in gauge are also accommodated by gauge-adjustable wheelsets, which were installed under some passenger vehicles on international links between Spain and France, Sweden and Finland, Poland and Lithuania, and Poland and Ukraine. In Spain, change-over facilities are extensive, since although track predominates, and high-speed lines are laid to standard gauge, there are many lines with narrower gauges ( and others). Dual-gauge railways by nation Australia In Victoria, there are sections of and dual-gauge track between Southern Cross station and West Footscray, Sunshine and Newport, Albion and Jacana, North Geelong and Gheringhap, Maryborough and Dunolly, and in various goods yards and industrial sidings. Until 2008, there was a dual-gauge line between Wodonga and Bandiana. At Albury railway station, New South Wales, a and dual-gauge line was in place until 2011. A dual-gauge line was within Tocumwal railway station until 1988, when the standard gauge component was put out of use. In 1900, in South Australia, a three-rail dual-gauge system was proposed in order to avoid a break of gauge. However, designing turnouts was considered to be difficult due to the difference of only between the and the broad gauge. After twenty years of discord, the proposal was abandoned. Much later, the South Australian Railways successfully adopted dual-gauge turnouts. In Western Australia, and of double-track dual-gauge extends for of the main line from East Perth to Northam. Dual-gauge track is also used from the triangle at Woodbridge to Cockburn Junction, then to Kwinana on one branch and North Fremantle on the other. The signalling system detects the gauge of the approaching train and puts the signals to stop if the route is set for the wrong gauge. In Queensland, there is a section of and dual-gauge track between