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2. O scale - Wikipedia

   en.wikipedia.org/wiki/O_scale

   O scale (or O gauge) is a scale commonly used for toy trains and rail transport modelling.Introduced by German toy manufacturer Märklin around 1900, by the 1930s three-rail alternating current O gauge was the most common model railroad scale in the United States and remained so until the early 1960s.

3. 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 ...

4. List of narrow-gauge model railway scales - Wikipedia

   en.wikipedia.org/wiki/List_of_narrow-gauge_model...

   Thus the scale and approximate prototype gauge are represented, with the model gauge used (9 mm for H0e gauge; 6.5 mm for H0f gauge) being implied. [2] The scales used include the general European modelling range of Z, N, TT, H0, 0 and also the large model engineering gauges of I to X, including 3 + 1 ⁄ 2, 5, 7 + 1 ⁄ 4 and 10 + 1 ⁄ 4-inch ...

5. List of track gauges - Wikipedia

   en.wikipedia.org/wiki/List_of_track_gauges

   Railways with a track gauge between 500 mm (19 + 3 ⁄ 4 in) and 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge. Diamond crossing dual gauge double line narrow-gauge and standard-gauge Narrow gauge track

6. Rail transport modelling scales - Wikipedia

   en.wikipedia.org/.../Rail_transport_modelling_scales

   In O scale terms, this is known as Mini-O Scale and in S Scale terms it is known as Major S Scale. O-27 scale: 1:48 (US) 31.7 mm A Lionel variant on O-scale. Has a slightly shorter profile and sharper 27 inch diameter curves (but also comes in 42, 54 and 72 inch diameter curves) than typical oversized O scale track.

7. Third rail (model rail) - Wikipedia

   en.wikipedia.org/wiki/Third_rail_(model_rail)

   GarGraves is a North American manufacturer of O gauge three-rail track with all of its rails insulated. Trix Express is a European manufacturer of three-rail track who insulates all three rails. On a simple, non-computerised layout only one train can run independently on either a two or three-rail system (two trains if combined with overhead ...