List of railroad truck parts

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

Axlebox

Also called an axle box, or Journal Box in North America.[1] This refers to the assembly of the truck or bogie which housing the end of the axle. Early axleboxes contained friction bearings, in which the axle spun in a bed of oil. Friction Bearings are now illegal in interchange service in the United States; modern axleboxes use roller bearings.[2][3] As early as 1908 they contained a set of long cylindrical rollers allowing the axle to rotate.[4][5] 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.[4][dubious ]

Center pin

A large steel pin—or rod—which passes through the center plates on the body bolster and truck bolster.[6] The truck turns about the bolt, and stress is taken by the center plates.[6]

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

Truck side frame

The frame at either side of the truck.[2][3]

Truck bolster

Each truck has a bolster—a transverse floating beam—between the side frames.[8] 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.[6][8]

Image gallery

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

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References

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Further reading

  • US Army Field Manual FM 55-20, Figure 8-8, Department of the Army, Washington DC
  • Car and Locomotive Cyclopedia 1970
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