{{Short description|Parts list of railroad trucks (bogies)}} {{Use Canadian English|date=January 2015}} {{Use dmy dates|date=January 2015}} [[File:Railroad truck, FM55-20.Fig8-8.png|thumb|right|375px|A [[William P. Bettendorf#bettendorf|Bettendorf]]-style [[Bogie|truck]] (bogie) with the names of its parts. The journal boxes are integral parts of the side frame. Most types of modern freight trucks originate in this design.]] A [[bogie]] or railroad truck holds the [[Wheelset (rail transport)|wheel sets]] of a rail vehicle.
== Axlebox == <!-- "Axlebox", "Axle box", and "Journal box" redirect here. --> An '''axlebox''', 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 bearing]]s on older rolling stock, or [[roller bearing]]s on newer rolling stock.<ref>{{Cite web |title=Railroad Dictionary: J |url=http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=J |publisher=CSX Corporation |website=CSX.com |date=2012 |access-date=15 November 2014 |archive-url=https://web.archive.org/web/20140729221255/http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=J |archive-date=29 July 2014 }}</ref>
[[Plain bearing]]s are now illegal for [[interchange service]] in North America.<ref>[https://www.worldcat.org/oclc/5245643 Car and Locomotive Cyclopedia 1969]</ref><ref name="col">{{Cite web |title=AAR M-1003 Certified Truck Component Manufacturing|url=http://www.columbuscastings.com/bolster_frames.html |archive-url=https://web.archive.org/web/20141112162356/http://www.columbuscastings.com/bolster_frames.html |archive-date=2014-11-12 |website=Columbus Castings |location=Columbus, Ohio|access-date=19 November 2014}}</ref><ref name="SCT">{{Cite web|title=General Information |url=http://www.sctco.com/pdf/sect_1.pdf |website=Standard Car Truck Company |date=January 2000 |access-date=19 November 2014 |archive-url=https://web.archive.org/web/20160304045504/http://www.sctco.com/pdf/sect_1.pdf |archive-date=4 March 2016 }}</ref> As early as 1908 axle boxes contained a set of [[Rolling-element bearing#Cylindrical roller|long cylindrical rollers]] allowing the axle to rotate.<ref name="AxleboxEvolution">{{Cite journal|title=The Evolution of Railway Axlebox Technology|url=http://evolution.skf.com/the-evolution-of-railway-axlebox-technology/|journal=Evolution|publisher=SKF|date=7 December 2010|access-date=18 September 2014}}</ref><ref>{{Cite web |title=Glossary: A|url=http://www.railway-technical.com/newglos.shtml#A|website=Railway-Technical.com|publisher=Railway Technical Web Pages|date=2014|access-date=19 November 2014 |archive-url=https://web.archive.org/web/20141007220720/http://www.railway-technical.com/newglos.shtml#A|archive-date=7 October 2014|df=dmy-all}}</ref> It was also used on [[steam locomotive]]s such as the [[Victorian Railways A2 class]], the [[LMS Garratt]], the [[LSWR 415 class]], and the [[GCR Class 1]].<ref name="AxleboxEvolution" />{{dubious|Axlebox|date=November 2014}}
== Center pin == A large steel pin—or rod—which passes through the center plates on the body bolster and truck bolster.<ref name="C">{{Cite web|title=Railroad Dictionary: C|url=http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=C|publisher=CSX Corporation|website=CSX.com|year=2012|access-date=15 November 2014|url-status=dead|archive-url=https://web.archive.org/web/20150401203313/http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=C|archive-date=1 April 2015|df=dmy-all}}</ref> The truck [[Rotation around a fixed axis|turns about]] the pin, and stress is taken by the center plates.<ref name="C" />
== 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.<ref name="C" /> The one on the truck may also be called center bowl.<ref>{{Cite web|title=APTA PR-CS-RP-003-98 Recommended Practice for Developing a Clearance Diagram for Passenger Equipment|url=http://www.apta.com/resources/standards/Documents/APTA-PR-CS-RP-003-98.pdf|website=APTA.com|publisher=[[American Public Transportation Association]]|date=26 March 1998|access-date=17 January 2015|archive-url=https://web.archive.org/web/20150626173746/http://www.apta.com/resources/standards/Documents/APTA-PR-CS-RP-003-98.pdf|archive-date=26 June 2015|url-status=dead}}</ref>
== Truck side frame == The frame at either side of the truck.<ref name="col" /><ref name="SCT" />
== Truck bolster == Each [[Bogie|truck]] has a bolster—a transverse floating beam—between the side frames.<ref name="B">{{Cite web|title=Railroad Dictionary: B|url=http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=B|publisher=CSX Corporation|website=CSX.com|year=2012|access-date=15 November 2014|url-status=dead|archive-url=https://web.archive.org/web/20140729222810/http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=B|archive-date=29 July 2014|df=dmy-all}}</ref> 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.<ref name="C" /><ref name="B" />
== Side bearing == 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 rigging == The '''brake rigging''' includes the brake lever, the brake hanger, the brake pin, the brake beam and the [[Brake shoe#Railway tread brake|brake shoes]]. {{expand section|date=February 2022}}
== Image gallery == <gallery mode="packed" heights="160px" caption="Journal boxes and axle boxes"> File:Journal box.png | An American journal box showing a [[plain bearing]]<ref name=CSXJ>[http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=J CSX Dictionary J] {{webarchive|url=https://web.archive.org/web/20140729221255/http://www.csx.com/index.cfm/about-csx/company-overview/railroad-dictionary/?i=J |date=2014-07-29 }}</ref> File:Bettendorf truck at Illinois Railway Museum.JPG | This [[William P. Bettendorf#bettendorf|Bettendorf]]-style freight car truck uses [[journal bearing]]s in [[journal box]]es that are integral parts of the [[List of railroad truck parts#Truck side frame|side frames]]. The center pin can be seen pointing up from the bolster. It has [[coil spring]]s. File:Rollingstock axle.jpg | Railroad car wheels are joined to a straight axle, allowing both [[Train wheel|wheels]] to rotate together. This is called a ''[[Wheelset (rail transport)|wheelset]]''. File:archbar ACL143.JPG | An [[Archbar freight truck|archbar-type truck]] with American style journal boxes that are [[Bolt (fastener)|bolted]] to ends of the side frame File:Seitenkipper-Ua4201-Drehgestell.jpg | A [[William P. Bettendorf#Later career|Bettendorf]]-style truck with [[axle box]]es, which are not part of the [[List of railroad truck parts#Truck side frame|side frames]], at the wheels File:Achslager-Nordbahn-Wagen.JPG|A [[Swiss Northern Railway|Swiss]] '''[[axlebox]]''' File:Oigawa-Archbar-Truck.jpg|Japanese archbar truck with axleboxes at the wheels File:Diamond Frame bogie (elliptical).jpg|Diamond frame bogie, [[elliptical spring]]s and American style [[journal box]]es File:JacobsBogieArticulatedWellCarCanadianPacificTrainBoltonON.jpg|Closeup of a shared bogie with 4 specially adapted [[List of railroad truck parts#Side bearing|side bearings]]<!-- Not a [[Jacobs bogie]] --> and an articulated connector between two sections of an [[Articulated car#Freight cars|articulated]] [[well car]]. The [[roller bearing]]s are not enclosed by an axle box. </gallery>
== See also == {{div col|colwidth=20em|style=column-count:2;}} * [[Axle track#Rail|Axle track]] * [[Ball bearing]]s, or [[roller bearing]]s, which replaced [[journal bearing]]s for [[Interchange (freight rail)|interchange]] * [[Glossary of North American railway terms]] * [[Glossary of rail transport terms]] * [[ICF Bogie]] * [[Rolling-element bearing#Roller bearings|Roller bearings]], replaced [[journal bearing]]s for [[Interchange (freight rail)|interchange]] * [[Rotation around a fixed axis]] * [[Stuffing box]] * [[Timmis system]], an early form of coil spring used on railway axles * [[Train wheel]] * [[Wheelbase#Rail|Wheelbase]] * [[Wheelset (rail transport)|Wheelset]] {{div col end}}
== References == {{Reflist}}
== Further reading == * US Army Field Manual FM 55-20, Figure 8-8, Department of the Army, Washington DC * [https://www.worldcat.org/oclc/5245643 Car and Locomotive Cyclopedia 1970] * {{Cite book| title=The Railroad Car Builder's Dictionary| first=Matthias N.| last=Forney| year=1879| publisher=[[Dover Publications]]}} * {{White-Passenger-1978}} * {{White - American railroad freight car}}
== External links == * [http://www.railway-technical.com/trains/rolling-stock-index-l/bogies.html Bogies/Trucks]
{{Locomotive running gear}}
{{DEFAULTSORT:Railroad truck parts}} [[Category:Bogie| ]] [[Category:Glossaries of rail transport|Truck parts]] [[Category:Vehicle technology|*]] [[Category:Car-related lists]] [[Category:Wikipedia glossaries using subheadings]]