List of railroad truck parts

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A diagram of an American-style truck showing the names of its parts


Also called an axle box. The housing attaching the end of the axle to the truck which as early as 1908 contained a set of long cylindrical rollers allowing the axle to rotate.[1][2] 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.[1][dubious ]

Center pin[edit]

A large steel pin—or rod—which passes through the center plates on the body bolster and truck bolster.[3] The truck turns about the bolt, and stress is taken by the center plates.[3]

Center plate[edit]

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.[3]

Journal box[edit]

The journal boxes were used with journal bearings.[4] Journal boxes are no longer used on North American railways.[5][6]

Truck side frame[edit]

The frame at either side of the truck.[5][6]

Truck bolster[edit]

Each truck has a bolster—a transverse floating beam—between the side frames.[7] 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.[3][7]

Image gallery[edit]

A journal box 
A German axlebox 
This Bettendorf-style freight car truck uses journal bearings in journal boxes. It also shows the center pin. 
Railroad car wheels are affixed to a straight axle, such that both wheels rotate in unison. This is called a wheelset
An archbar-type truck with journal boxes 
A diamond truck with axle boxes 

See also[edit]


  1. ^ a b "The Evolution of Railway Axlebox Technology". Evolution (SKF). 2010-12-07. Retrieved 2014-09-18. 
  2. ^ "Glossary: A". Railway Technical Web Pages. 2014. Retrieved 2014-11-19. 
  3. ^ a b c d "Railroad Dictionary: C". CSX Corporation. 2012. Retrieved 2014-11-15. 
  4. ^ "Railroad Dictionary: J". CSX Corporation. 2012. Retrieved 2014-11-15. 
  5. ^ a b "AAR M-1003 Certified Truck Component Manufacturing". Columbus, Ohio: Columbus Castings. Retrieved 2014-11-19. 
  6. ^ a b "General Information" (PDF). Standard Car Truck Company. January 2000. Retrieved 2014-11-19.  |chapter= ignored (help)
  7. ^ a b "Railroad Dictionary: B". CSX Corporation. 2012. Retrieved 2014-11-15.