List of railroad truck parts


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

A diagram of an American-style truck showing the names of its parts and showing the journal boxes to be integral parts of the side frame


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 bearings on older rolling stock, or roller bearings on newer rolling stock.[1]

Plain bearings are now illegal for interchange service in North America.[2][3][4] As early as 1908 axle boxes contained a set of long cylindrical rollers allowing the axle to rotate.[5][6] It was also used on steam locomotives such as the Victorian Railways A2 class, the LMS Garratt, the LSWR 415 class, and the GCR Class 1.[5][dubious ]

Center pinEdit

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

Center plateEdit

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]

Truck side frameEdit

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

Truck bolsterEdit

Each truck has a bolster—a transverse floating beam—between the side frames.[9] It is the central part of every truck on which the underframe of the railcar or railroad car is pivoted through the center pivot pin.[7][9]

Side bearingEdit

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 riggingEdit

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

Image galleryEdit

See alsoEdit


  1. ^ "Railroad Dictionary: J". CSX Corporation. 2012. Archived from the original on 29 July 2014. Retrieved 15 November 2014.
  2. ^ Car and Locomotive Cyclopedia 1969
  3. ^ a b "AAR M-1003 Certified Truck Component Manufacturing". Columbus Castings. Columbus, Ohio. Archived from the original on 12 November 2014. Retrieved 19 November 2014.
  4. ^ a b "General Information" (PDF). Standard Car Truck Company. January 2000. Archived from the original (PDF) on 4 March 2016. Retrieved 19 November 2014.
  5. ^ a b "The Evolution of Railway Axlebox Technology". Evolution. SKF. 7 December 2010. Retrieved 18 September 2014.
  6. ^ "Glossary: A". Railway Technical Web Pages. 2014. Archived from the original on 7 October 2014. Retrieved 19 November 2014.
  7. ^ a b c d "Railroad Dictionary: C". CSX Corporation. 2012. Archived from the original on 1 April 2015. Retrieved 15 November 2014.
  8. ^ "APTA PR-CS-RP-003-98 Recommended Practice for Developing a Clearance Diagram for Passenger Equipment" (PDF). American Public Transportation Association. 26 March 1998. Archived from the original (PDF) on 26 June 2015. Retrieved 17 January 2015.
  9. ^ a b "Railroad Dictionary: B". CSX Corporation. 2012. Archived from the original on 29 July 2014. Retrieved 15 November 2014.
  10. ^ CSX Dictionary J Archived 2014-07-29 at the Wayback Machine

Further readingEdit

External linksEdit

  • Bogies/Trucks