Abogie or railroad truck holds thewheel sets of a rail vehicle.

Anaxlebox, also known as ajournal 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-bathedplain bearings on older rolling stock, orroller bearings on newer rolling stock.^[1]

Plain bearings are now illegal forinterchange service in North America.^[2][3][4] As early as 1908 axle boxes contained a set oflong cylindrical rollers allowing the axle to rotate.^[5][6] It was also used onsteam locomotives such as theVictorian Railways A2 class, theLMS Garratt, theLSWR 415 class, and theGCR Class 1.^{[5][dubious –discuss]}

A large steel pin—or rod—which passes through the center plates on the body bolster and truck bolster.^[7] The truckturns about the pin, and stress is taken by the center plates.^[7]

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.^[7] The one on the truck may also be called center bowl.^[8]

The frame at either side of the truck.^[3][4]

Eachtruck has a bolster—a transverse floating beam—between the side frames.^[9] It is the central part of every truck on which theunderframe of therailcar orrailroad car is pivoted through the center pivot pin.^[7][9]

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.

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

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• Journal boxes and axle boxes
• 
  An American journal box showing aplain bearing^[10]
• 
  ThisBettendorf-style freight car truck usesjournal bearings injournal boxes that are integral parts of theside frames. The center pin can be seen pointing up from the bolster. It hascoil springs.
• 
  Railroad car wheels are joined to a straight axle, allowing bothwheels to rotate together. This is called awheelset.
• 
  Anarchbar-type truck with American style journal boxes that arebolted to ends of the side frame
• 
  ABettendorf-style truck withaxle boxes, which are not part of theside frames, at the wheels
• 
  ASwissaxlebox
• 
  Japanese archbar truck with axleboxes at the wheels
• 
  Diamond frame bogie,elliptical springs and American stylejournal boxes
• 
  Closeup of a shared bogie with 4 specially adaptedside bearings and an articulated connector between two sections of anarticulatedwell car. Theroller bearings are not enclosed by an axle box.

• US Army Field Manual FM 55-20, Figure 8-8, Department of the Army, Washington DC
• Car and Locomotive Cyclopedia 1970
• Forney, Matthias N. (1879).The Railroad Car Builder's Dictionary.Dover Publications.
• White, John H. (1978).The American Railroad Passenger Car. Baltimore, MD:Johns Hopkins University Press.ISBN 0801819652.OCLC 2798188.
• White, John H. Jr. (1993).The American Railroad Freight Car: From the Wood-Car Era to the Coming of Steel. Baltimore:Johns Hopkins University Press.ISBN 0-8018-4404-5.OCLC 26130632.

• Bogies/Trucks

• Bogie
• Glossaries of rail transport
• Vehicle technology
• Car-related lists

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