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On a steam locomotive, a leading wheel or leading axle is an unpowered wheel or axle located in front of the driving wheels. The axle of the leading wheels were usually located on a leading truck. Leading wheels are used to help the locomotive negotiate turns and to hold up the front portion of the boiler. The first use of leading wheels is commonly attributed to the 4-2-0 designs of John B. Jervis in 1832 (a locomotive type that has since become known as the Jervis type). Great Western Railway No. ...
A wheel is a circular object that together with an axle allows low friction motion, e. ...
An axle is a central shaft for a rotating wheel or gear. ...
US_style railroad truck. ...
The Chicago & Northwestern Railways first locomotive, 4-2-0 Pioneer. ...
1832 was a leap year starting on Sunday (see link for calendar). ...
In the Whyte notation, leading wheels are designated by the first number in the series. For example, the 2-8-2 Mikado type locomotive had two leading wheels, eight driving wheels, and two trailing wheels. Some locomotives such as the 0-10-2 Union type had no leading wheels and were thus designated with a zero in the first position. The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early 20th century. ...
In the Whyte notation, a 2-8-2 is a railroad steam locomotive that has one unpowered leading axle followed by four powered driving axles and one unpowered trailing axle. ...
On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotives pistons (or turbine, in the case of a steam turbine locomotive). ...
An 0-10-2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with no leading wheels at all, ten driving wheels, and a two-wheel trailing truck. ...
In the Whyte notation the number designates the number of wheels rather than the number of axles, thus the first 2 in the Mikado's 2-8-2 refers to two wheels (one axle) while the first 4 in the Northern type's 4-8-4 designation refers to four wheels (two axles). The Norfolk & Western Railways Class J locomotive #611, a 1950 product of the railroads own Roanoke, Virginia shops. ...
The highest number of leading wheels on a single locomotive is six as seen on the 6-2-0 Crampton type and the 6-8-6 Pennsylvania Railroad steam turbine locomotives. In the Whyte notation, a 6-2-0 is a railroad steam locomotive that has an unpowered three-axle leading truck followed by a single powered driving axle. ...
In Whyte notation a 6-8-6 is a steam locomotive with six unpowered leading wheels arranged into a three-axle leading truck, eight powered driving wheels, and six unpowered trailing wheels arranged into a three-axle trailing truck. ...
See also
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