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The small rail wheels fitted to road–rail vehicles allow them to be stowed away when the vehicle is in road-going mode. Wheels used for road–rail vehicles are normally smaller than those found on other types of rolling stock, such as locomotives or carriages, because the wheel has to be stowed clear of the ground when the vehicle is in road-going mode.
SCOA-P driving wheels. SCOA-P pattern wheels are a type of steam locomotive wheel. Rather than having traditional solid spokes, the SCOA-P spoke is hollow, with a U-shaped cross section. They are considerably lighter than a conventional spoked wheel or Boxpok wheel of the same size and strength.
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. [1] Several notations exist to describe the wheel assemblies of a locomotive by type, position, and connections, with the adopted notations varying by country.
Steel tire on a steam locomotive's driving wheel is heated with gas flames to expand and loosen it so it may be slipped over the wheel.. The steel wheel of a steam locomotive and other older types of rolling stock were usually fitted with a steel tire (American English) or tyre (in British English, Australian English and others) to provide a replaceable wearing element on a costly wheel.
Boxpok driving wheels. A Boxpok is a steam locomotive wheel that gains its strength through being made of a number of box sections rather than having traditional solid spokes (the name is a variation on "box-spoke"). Being hollow, they allow better counterbalancing and
Locomotives from the National Collection in the Great Hall of the UK National Railway Museum. The UK National Collection is a collection of around 280 historic rail vehicles (predominantly of British origin). The majority of the collection is kept at four national museums: National Railway Museum, York; Locomotion, Shildon
The number of driving wheels on locomotives varied quite a bit. Some early locomotives had as few as two driving wheels (one axle). The largest number of total driving wheels was 24 (twelve axles) on the 2-8-8-8-2 and 2-8-8-8-4 locomotives. The largest number of coupled driving wheels was 14 (seven axles) on the ill-fated AA20 4-14-4 locomotive.
The locomotive's Type FT tender was an experimental type using six pairs of wheels in a 2-8-2 wheel arrangement, with the leading and trailing wheels as bissel-type pony trucks and the remainder mounted on a rigid wheelbase.