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There are two massive HO scale layouts, a 1,200 sq ft (110 m 2) N scale layout, a 2,700 sq ft (250 m 2) O scale layout, and a Lionel type 3-Rail O gauge Toy Train gallery. Cabrillo & Southwestern (O scale). This 2,700 sq ft (250 m 2) layout is a freelance representation of a route from San Diego to Sacramento. Pacific Desert Lines (N scale).
3 rail system. A key advantage for three-rail track is balloon loops, where a train enters a loop through a turnout and then exits through the same turnout in order to change the train's direction. With two-rail track, when the track reverses on itself, this causes a short circuit. With three-rail track, because the center rail remains constant ...
3 ft (914 mm) gauge was the narrow gauge used in Ireland, and the gauge of almost all the railways on the Isle of Man. It was also used on a handful of railways in Britain. However modelling these 3 ft gauge railways is very much a minority pursuit, especially when compared with other prototypes such as the Welsh 2 ft (610 mm) narrow gauge ...
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Sn3½ is also used to represent 3 ft 6 in (1,067 mm), as the gauge is the same as HO scale. HOm uses the same 12mm gauge track to represent metre-gauge (3ft3.37in) railways. HOn3 uses 10.5 mm ( 0.413 in ) gauge to represent 3 ft ( 914 mm ) gauge railways H0e /HOn30 uses 9 mm ( 0.354 in ) gauge to represent railway with gauges of about 750 ...
Track gauge conversion is the changing of one railway track gauge (the distance between the running rails) to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.
Measurement of track spacing from the rail head to rail head. By definition, the track spacing is given from centre to centre of a rail track. For an actual construction the distance is measured from the inside of a rail head to the matching one of the other track. As far as both tracks have the same gauge this is the same distance.
In the same scale standard-gauge trains are modelled on 16.5 mm (0.65 in) gauge track, known as H0. Narrow-gauge trains are usually modelled on 9 mm (0.354 in) gauge track which is known as H0e and industrial minimum-gauge lines are modelled on 6.5 mm (0.256 in) gauge track known as H0f gauge.