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  2. 2-6-6-2 - Wikipedia

    en.wikipedia.org/wiki/2-6-6-2

    Baldwin added Mallet locomotives to their catalog before World War I, both in standard gauge and narrow gauge, and in both tank and tender versions. [55] They continued to produce small lots for logging railroads in the Western US until the 1930s. These were generally standard gauge 2-6-6-2 tank engines, either being saddle tanks or pannier tanks.

  3. OO9 - Wikipedia

    en.wikipedia.org/wiki/OO9

    It is a common choice in the United Kingdom for the modelling of narrow-gauge railways whose prototype gauges lie approximately between 2 ft (610 mm) and 2 ft 6 in (762 mm). The 9 mm ( 0.354 in ) track gauge is used by N gauge model railways, a common commercial scale, which means that a selection of wheels, track, and mechanisms is readily ...

  4. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    This gauge is represented by the EM Society (in full, Eighteen Millimetre Society). 00 track (16.5 mm) is the wrong gauge for 1:76 scale, but use of an 18.2 mm (0.717 in) gauge track is accepted as the most popular compromise towards scale dimensions without having to make significant modifications to ready-to-run models. Has a track gauge ...

  5. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    Rail gauge world Map, 600mm. to 1676 mm. Rail gauge world Map, 597 mm. to 1829 mm. and 2140 mm. Map of the world's railways showing the different major gauges in use. 3 ft gauge (914 mm) Meter gauge (1,000 mm)

  6. Bore gauge - Wikipedia

    en.wikipedia.org/wiki/Bore_gauge

    Small-hole gauge set. Sizes from top to bottom: 3 to 5 mm (0.118 to 0.197 in) 5 to 7.5 mm (0.197 to 0.295 in) 7.5 to 10 mm (0.295 to 0.394 in) 10 to 13 mm (0.394 to 0.512 in) Small-hole gauges require a slightly different technique to the telescopic gauges, the small hole gauge is initially set smaller than the bore to be measured.

  7. Live steam - Wikipedia

    en.wikipedia.org/wiki/Live_steam

    For instance, scales of 1.5, 1.6, 2.5, and 3 inches per foot (corresponding to scales of 1:8 to 1:4) have been used on a 7 + 1 ⁄ 2 in (190.5 mm) track gauge. The generally accepted smallest gauge for a live steam locomotive is O scale. Producing smaller-scale models remains problematic, as the laws of physics do not themselves scale: creating ...