bogie A bogie ( ) (in some senses called a truck in North American English) is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles. Bogies take various forms in various modes of tr ...

or railroad truck holds the wheel sets of a rail vehicle.

Axlebox

An ''axle box'', also known as a ''journal box'' in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed

plain bearing A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no roll ...

s on older rolling stock, or

roller bearing In mechanical engineering, a rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two concentric, grooved rings called races. The relative m ...

s on newer rolling stock.

Plain bearing A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no roll ...

s are now illegal for

interchange service In freight rail transport, interchange is the practice of railroads conveying freight cars ("foreign" cars) from other companies over their lines. This benefits shippers, whose cargo might otherwise have to be transhipped if the point of origin and ...

in North America. As early as 1908 axle boxes contained a set of long cylindrical rollers allowing the axle to rotate. It was also used on

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the loco ...

s such as the Victorian Railways A2 class, the LMS Garratt, the LSWR 415 class, and the GCR Class 1.

Center pin

A large steel pin—or rod—which passes through the center plates on the body bolster and truck bolster. The truck turns about the pin, and stress is taken by the center plates.

Center plate

One of a pair of plates which fit one into the other and support the car body on the trucks allowing them to turn freely under the car. The one on the truck may also be called center bowl.

Truck side frame

The frame at either side of the truck.

Truck bolster

Each

truck A truck or lorry is a motor vehicle designed to transport cargo, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame constructi ...

has a bolster—a transverse floating beam—between the side frames. It is the central part of every truck on which the

underframe An underframe is a framework of wood or metal carrying the main body structure of a railway vehicle, such as a locomotive, carriage or wagon. See also * Chassis * Headstock * Locomotive bed * Locomotive frame A locomotive frame is the str ...

of the

railcar A railcar (not to be confused with a railway car) is a self-propelled railway vehicle designed to transport passengers. The term "railcar" is usually used in reference to a train consisting of a single coach (carriage, car), with a drive ...

railroad car A railroad car, railcar ( American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is ...

is pivoted through the center pivot pin.

Side bearing

There is one side bearing located on each side of the centerplate on the truck bolster. In case of a shared bogie on an articulated car, there are two on each side.

Brake rigging

The brake rigging includes the brake lever, the brake hanger, the brake pin, the brake beam and the brake shoes.

Image gallery

File:Journal box.png , An American journal box showing a

CSX Dictionary J
File:Bettendorf truck at Illinois Railway Museum.JPG , This Bettendorf-style freight car truck uses

journal bearing A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no roll ...

s in journal boxes that are integral parts of the side frames. The center pin can be seen pointing up from the bolster. It has

coil spring A selection of conical coil springs The most common type of spring is the coil spring, which is made out of a long piece of metal that is wound around itself. Coil springs were in use in Roman times, evidence of this can be found in bronze Fi ...

s File:Rollingstock axle.jpg , Railroad car wheels are affixed to a straight axle, such that both

wheels A wheel is a circular component that is intended to rotate on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be ...

rotate in unison. This is called a '' wheelset''. File:archbar ACL143.JPG , An archbar-type truck with American style journal boxes that are bolted to ends of the side frame File:Seitenkipper-Ua4201-Drehgestell.jpg , A Bettendorf-style truck with axle boxes, which are not part of the side frames, at the wheels File:Achslager-Nordbahn-Wagen.JPG, A

Swiss Swiss may refer to: * the adjectival form of Switzerland * Swiss people Places * Swiss, Missouri *Swiss, North Carolina * Swiss, West Virginia * Swiss, Wisconsin Other uses * Swiss-system tournament, in various games and sports *Swiss Internati ...

axlebox File:Oigawa-Archbar-Truck.jpg, Japanese archbar truck with axleboxes at the wheels File:Diamond Frame bogie (elliptical).jpg, Diamond frame bogie,

elliptical spring A leaf spring is a simple form of spring commonly used for the suspension in wheeled vehicles. Originally called a ''laminated'' or ''carriage spring'', and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it ...

s and American style journal boxes File:JacobsBogieArticulatedWellCarCanadianPacificTrainBoltonON.jpg, Closeup of a shared bogie with 4 specially adapted side bearings and an articulated connector between two sections of an

articulated An articulated vehicle is a vehicle which has a permanent or semi-permanent pivot joint in its construction, allowing it to turn more sharply. There are many kinds, from heavy equipment to buses, trams and trains. Steam locomotives were sometim ...

well car A well car, also known as a double-stack car (or also intermodal car/container car), is a type of railroad car specially designed to carry intermodal containers (shipping containers) used in intermodal freight transport. The "well" is a depress ...

. The

s are not enclosed by an axle box.

References

External links

Truck parts * Car-related lists {{Rail-transport-stub