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Steam-cleaning the running gear of an "H" class locomotive, Chicago and North Western RailwayRunning gear of steam locomotive Running gear animation Running gear includes the brake gear, wheel setsaxleboxesspringing and the motion that includes connecting rods and valve gear.
The transmission of the power from the pistons to the rails and the behaviour of the locomotive as a vehicle, being able to negotiate curves, points and irregularities in the track, is of paramount importance.
Adhesive weight is the portion of the locomotive's weight bearing on the driving wheels. This is made more effective if a pair of driving wheels is able to make the most of its axle load, i.
Equalising beams connecting the ends of leaf springs have often been deemed a complication in Britain, however locomotives fitted with the beams have usually been less prone to loss of traction due to wheel-slip.
Suspension using equalizing levers between driving axles, and between driving axles and trucks, was standard practice on North American locomotives to maintain even wheel loads when operating on uneven track.
Locomotives with total adhesion, where all of the wheels are coupled together, generally lack stability at speed. These usually take on weight — of the cylinders at the front or the firebox at the rear — when the width exceeds that of the mainframes.
Locomotives with multiple coupled-wheels on a rigid chassis would have unacceptable flange forces on tight curves giving excessive flange and rail wear, track spreading and wheel climb derailments.
One solution was to remove or thin the flanges on an axle. More common was to give axles end-play and use lateral motion control with spring or inclined-plane gravity devices. Railroads generally preferred locomotives with fewer axles, to reduce maintenance costs.
The number of axles required was dictated by the maximum axle loading of the railroad in question. A builder would typically add axles until the maximum weight on any one axle was acceptable to the railroad's maximum axle loading.
A locomotive with a wheel arrangement of two lead axles, two drive axles, and one trailing axle was a high-speed machine. Two lead axles were necessary to have good tracking at high speeds. Two drive axles had a lower reciprocating mass than three, four, five or six coupled axles.
They were thus able to turn at very high speeds due to the lower reciprocating mass. A trailing axle was able to support a huge firebox, hence most locomotives with the wheel arrangement of American Type Atlantic were called free steamers and were able to maintain steam pressure regardless of throttle setting.
Chassis[ edit ] The chassis, or locomotive frameis the principal structure onto which the boiler is mounted and which incorporates the various elements of the running gear. The boiler is rigidly mounted on a "saddle" beneath the smokebox and in front of the boiler barrel, but the firebox at the rear is allowed to slide forward and backwards, to allow for expansion when hot.
European locomotives usually use "plate frames", where two vertical flat plates form the main chassis, with a variety of spacers and a buffer beam at each end to keep them apart. When inside cylinders are mounted between the frames, the plate frames are a single large casting that forms a major support.Moya K.
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A steam locomotive is a type of railway locomotive that produces its pulling power through a steam regardbouddhiste.com locomotives are fueled by burning combustible material – usually coal, wood, or oil – to produce steam in a regardbouddhiste.com steam moves reciprocating pistons which are mechanically connected to the locomotive's main wheels (drivers).
Both fuel and water supplies are carried with the.
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