Editing HO scale (section)

==Models==
Because of the scale's popularity, a huge array of models, kits and supplies are manufactured. The annual HO scale catalog by [[Wm. K. Walthers]], North America's largest model railroad supplier, lists more than 1,000 pages of products in that scale alone. Models are generally available in three varieties:
* ''Ready-to-run'' models are fully ready for use right out of the box. Generally, this means [[Railway coupling|couplers]], trucks ([[bogie]]s), and other integral parts are installed at the factory, although some super detailing parts may still need to be attached.
* ''Shake-the-box'' kits are simple, easy-to-assemble kits; a freight car might include a one-piece body, a chassis, trucks, couplers, and a weight, while a structure kit might include walls, windows, doors, and glazing. The name derives from the joke that no skill was required – shake the box, and the kit falls together. A common synonym is ''screwdriver kit'' as many can be assembled with a screwdriver and tweezers.
* ''Craftsman kits'' require a much higher level of skill to assemble and can include several hundred parts.
In addition to these kits, numerous manufacturers sell individual supplies for [[super detailing]], [[scratch building]], and [[kitbashing]].

Quality varies extremely. Toylike, ready-to-run trains using plastic molds which are well over 50 years old are still sold; at the other are highly detailed limited-edition [[locomotive]] models made of [[Brass model|brass]] by companies based in Japan and South Korea. A popular locomotive such as the [[EMD F7|F7]]/[[EMD F9|F9]] may be available in thirty different versions with prices ranging from twenty to several thousand dollars or euros.