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- Leading_wheel abstract "The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves and to support the front portion of the boiler. Importantly, the leading bogie does not have simple rotational motion about a vertical pivot, as might first be thought. It must also be free to slip sideways to a small extent (otherwise the locomotive is unable to follow curves accurately – a point lost on the 19th century railway pioneers), and some kind of springing mechanism is normally included to control this movement and give a tendency to return to centre. The sliding bogie of this type was patented by William Adams in 1865.The first use of leading wheels is commonly attributed to John B. Jervis who employed them in his 1832 design for a locomotive with four leading wheels and two driving wheels (a type that became known as the Jervis). In the Whyte system of describing locomotive wheel arrangements, his locomotive would be classified as a 4-2-0: that is to say, it had four leading wheels, two driving wheels, and no trailing wheels. In the UIC classification system, which counts axles rather than wheels and uses letters to denote powered axles, the Jervis would be classified 2A.Locomotives without leading trucks are generally regarded as unsuitable for high speed use. The British Railway Inspectorate condemned the practice in 1895, following an accident involving two 0-4-4s at Doublebois, Cornwall, on the Great Western Railway. Other designers, however, persisted with the practice and the famous 0-4-2 Gladstone class passenger expresses of the London, Brighton and South Coast Railway remained in trouble-free service until 1933. A single leading axle (known as a pony truck) increases stability somewhat, while a four-wheel leading truck is almost essential for high-speed operation. The highest number of leading wheels on a single locomotive is six as seen on the 6-2-0 Crampton type and the Pennsylvania Railroad's 6-4-4-6 S1 duplex locomotive and 6-8-6 S2 steam turbine. Six-wheel leading trucks were not very popular. The Cramptons were built in the 1840s, but it was not until 1939 that the PRR used one on the S1.".
- Leading_wheel thumbnail 462leading_flip.jpg?width=300.
- Leading_wheel wikiPageID "30864070".
- Leading_wheel wikiPageLength "3674".
- Leading_wheel wikiPageOutDegree "36".
- Leading_wheel wikiPageRevisionID "654085191".
- Leading_wheel wikiPageWikiLink 0-4-2.
- Leading_wheel wikiPageWikiLink 0-4-4T.
- Leading_wheel wikiPageWikiLink 4-2-0.
- Leading_wheel wikiPageWikiLink 6-2-0.
- Leading_wheel wikiPageWikiLink 6-4-4-6.
- Leading_wheel wikiPageWikiLink 6-8-6.
- Leading_wheel wikiPageWikiLink AAR_wheel_arrangement.
- Leading_wheel wikiPageWikiLink Adams_axle.
- Leading_wheel wikiPageWikiLink Axle.
- Leading_wheel wikiPageWikiLink Bogie.
- Leading_wheel wikiPageWikiLink Category:Train_wheels.
- Leading_wheel wikiPageWikiLink Crampton_locomotive.
- Leading_wheel wikiPageWikiLink Disused_railway_stations_(Cornish_Main_Line).
- Leading_wheel wikiPageWikiLink Driving_wheel.
- Leading_wheel wikiPageWikiLink Duplex_locomotive.
- Leading_wheel wikiPageWikiLink Great_Western_Railway.
- Leading_wheel wikiPageWikiLink Her_Majestys_Railway_Inspectorate.
- Leading_wheel wikiPageWikiLink John_B._Jervis.
- Leading_wheel wikiPageWikiLink LB&SCR_B1_class.
- Leading_wheel wikiPageWikiLink London,_Brighton_and_South_Coast_Railway.
- Leading_wheel wikiPageWikiLink PRR_S1.
- Leading_wheel wikiPageWikiLink PRR_S2.
- Leading_wheel wikiPageWikiLink Pennsylvania_Railroad.
- Leading_wheel wikiPageWikiLink Pony_truck.
- Leading_wheel wikiPageWikiLink Steam_locomotive.
- Leading_wheel wikiPageWikiLink Trailing_wheel.
- Leading_wheel wikiPageWikiLink UIC_classification_of_locomotive_axle_arrangements.
- Leading_wheel wikiPageWikiLink Wheel.
- Leading_wheel wikiPageWikiLink Wheel_arrangement.
- Leading_wheel wikiPageWikiLink Whyte_notation.
- Leading_wheel wikiPageWikiLink William_Adams_(locomotive_engineer).
- Leading_wheel wikiPageWikiLink File:462leading_flip.jpg.
- Leading_wheel wikiPageWikiLinkText "Leading wheel".
- Leading_wheel wikiPageWikiLinkText "Leading".
- Leading_wheel wikiPageWikiLinkText "Pilot truck/Leading bogie".
- Leading_wheel wikiPageWikiLinkText "leading axle".
- Leading_wheel wikiPageWikiLinkText "leading bogie wheels".
- Leading_wheel wikiPageWikiLinkText "leading bogie".
- Leading_wheel wikiPageWikiLinkText "leading wheel".
- Leading_wheel wikiPageWikiLinkText "leading".
- Leading_wheel wikiPageWikiLinkText "small wheels".
- Leading_wheel wikiPageUsesTemplate Template:Citation_needed.
- Leading_wheel wikiPageUsesTemplate Template:Locomotive_running_gear.
- Leading_wheel wikiPageUsesTemplate Template:Reflist.
- Leading_wheel subject Category:Train_wheels.
- Leading_wheel hypernym Wheel.
- Leading_wheel type Locomotive.
- Leading_wheel type MeanOfTransportation.
- Leading_wheel type Locomotive.
- Leading_wheel type Machine.
- Leading_wheel type Technology.
- Leading_wheel type Wheel.
- Leading_wheel comment "The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves and to support the front portion of the boiler. Importantly, the leading bogie does not have simple rotational motion about a vertical pivot, as might first be thought.".
- Leading_wheel label "Leading wheel".
- Leading_wheel sameAs Q2043007.
- Leading_wheel sameAs 先輪.
- Leading_wheel sameAs m.05k58c.
- Leading_wheel sameAs Бегунковые_колёсные_пары.
- Leading_wheel sameAs Бігунок_(колісна_пара).
- Leading_wheel sameAs Q2043007.
- Leading_wheel wasDerivedFrom Leading_wheel?oldid=654085191.
- Leading_wheel depiction 462leading_flip.jpg.
- Leading_wheel isPrimaryTopicOf Leading_wheel.