end of the loop were set according to the train's direction of travel. Trains running uphill were routed via the loop incorporating the sprung catch point. Trains running downhill used the opposite loop, bypassing the catch point. Single-gauntlet-double Where tracks diverge, but it is not practical to locate the physical switch apparatus at the point of divergence (especially on trams, where roads may be in the way), a section of gauntlet track may be provided between where the tracks actually diverge and the location of the physical switch. Dual-gauge track An arrangement similar to gauntlet track is sometimes used to allow trains of different gauges to use the same track. In that case, the two interlaced tracks will have different gauges, sometimes sharing one of the rails for a total of three rails when the difference between the track gauges is large enough. Examples Australia In Melbourne, broad (1600 mm) and standard dual gauge gauntlet track is located within the passenger yard of Southern Cross station, and in platforms 1 and 2. Those tracks also run on the Regional Rail Link flyover towards South Dynon yards. The northern section of the Upfield line, between the Ford sidings and Somerton, is also dual gauge gauntlet track. On the Western standard gauge line from Melbourne towards Adelaide, dual gauge track can be found between the Geelong Harbour and Gheringhap, as well as along the Newport-Sunshine freight line in Melbourne. Belgium/Germany The Gemmenich Tunnel (, ) passing under the (Three country point) has a special track layout to enable the passage of wide military loads. The double-track tunnel has a third set of rails interlaced with one of the normal tracks. Active points (switches) at each end of the tunnel allow a train to divert along the central track, whilst other trains are blocked by signalling. The third track is rarely in use, so there is no limitation of capacity through the tunnel for standard-sized trains. Close to where the borders of Belgium, Germany and the Netherlands come together, the interlaced tunnel section provides an important connection between Germany and the Belgian harbour at Antwerp. After completing the installation in 1991, trains with an oversize loading gauge were rerouted over this line, and the lightly used (but tunnel-free) secondary line between Stolberg and Welkenraedt (crossing the border at Raeren) was closed to freight traffic. Electric-hauled trains requiring use of the central track will