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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.
The Erie L-1s were camelback 0-8-8-0s 0-8-8-0 No. 8701 of the New York Central Railroad at Detroit, Michigan in 1921. This is a transfer locomotive. In the Whyte notation for classifying the wheel arrangement of steam locomotives, an 0-8-8-0 is a locomotive with two sets of eight driving wheels and neither leading wheels nor trailing wheels.
Looking to expand into the world of scale model railroading, the company put together a plan to manufacture models with more accurate and fine details as well as an improved motor drive, with a reasonable increase in cost. In 1989, Life-Like introduced the Proto 2000 line of finely detailed HO scale diesel locomotives.
In 2006, Horizon purchased McHenry Couplers and in 2007 acquired the tooling for several trailers from A-Line, which are released in the Ready To Roll product line [6] In 2008, Athearn acquired the tooling for the short-lived "Tower 55" series of HO scale diesels from Overland Models. Much of this tooling made its way into the Athearn Genesis line.
The 37.5 mm length is not derived by a certain scale ratio. While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm (0.65 in) gauge from real life prototype 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.
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.
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