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.

This sectionneeds expansion. You can help byadding missing information.(February 2022)

• 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

• Webarchive template wayback links
• Articles with short description
• Short description is different from Wikidata
• Use Canadian English from January 2015
• All Wikipedia articles written in Canadian English
• Use dmy dates from January 2015
• All accuracy disputes
• Articles with disputed statements from November 2014
• Articles to be expanded from February 2022
• All articles to be expanded
• Wikipedia glossaries using subheadings