List of railroad truck parts

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


An axle box, also known as a journal box in North America, are the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; they contain bearings and thus transfer the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rollingstock, or roller bearings on newer rollingstock. [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]

Center pin

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

Truck side frame

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

Truck bolster

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 bearing

There is one side bearing located on each sde of the centerplate on the truck bolster.

See also


  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. [httnoqp:// "AAR M-1003 Certified Truck Component Manufacturing"]. Columbus, Ohio: Columbus Castings. Retrieved 19 November 2014.
  4. "General Information" (PDF). Standard Car Truck Company. January 2000. Archived from the original (PDF) on 4 March 2016. Retrieved 19 November 2014. |section= ignored (help)
  5. "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. "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. "Railroad Dictionary: B". CSX Corporation. 2012. Archived from the original on 29 July 2014. Retrieved 15 November 2014.

Further reading

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