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HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. [1] [2] The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge tracks and trains in HO.
For HO and O-scales, NMRA uses the letter "O" whereas NEM uses the number zero (H0 instead of HO). The NMRA published alternative, more accurate and realistic standards for track and wheels sheet in S-1.1 These model railway standards are based on the full size prototype standards and the scale model operational reliability is therefore reduced ...
A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks. The wheel acts as a rolling component, typically press fitted onto an axle and mounted directly on a railway carriage or locomotive , or indirectly on a bogie (in the UK), also called a truck (in North America).
Especially in steam days, wheel arrangement was an important attribute of a locomotive because there were many different types of layout adopted, each wheel being optimised for a different use (often with only some being actually "driven"). Modern diesel and electric locomotives are much more uniform, usually with all axles driven.
Most train wheels have a conical taper of about 1 in 20 to enable the wheelset to follow curves with less chance of the wheel flanges coming in contact with the rail sides, and to reduce curve resistance. The rails generally slant inwards at 1 in 40, a lesser angle than the wheel cone.
American and European model trains in N scale. Commonly used for mini armor. 10 mm to 12 mm figure scale for miniature wargaming. 1:152: 2.005 mm 2mm scale / British N scale railway modeling. 1:150: 2.032 mm: Model railways (Japanese N) Used by Heller for model ships, and proposed by the Japanese to supersede 1:144 scale trains. Models which ...
Many names, particularly those of British origin, such as O14 and 00-9 combine the name of the scale used with the physical measurement of the gauge, i.e. the 7 mm-to-the-foot scale from standard O gauge with a rail gauge of 14 mm, giving a precise representation of 2 ft (610 mm) prototypes.
It is the most popular standard in the UK for 4 mm scale trains [5] and is produced by the two main manufacturers in the UK. The traditional standard for wheels and track is a very coarse one with extremely oversize rails and flanges ; in recent years, some manufacturers have switched to using the American National Model Railroad Association HO ...