{{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 Bettendorf-style 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 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 bearings on older rolling stock, or roller bearings 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 bearings 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 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 locomotives 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 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 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 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 Bettendorf-style freight car truck uses journal bearings in journal boxes that are integral parts of the side frames. The center pin can be seen pointing up from the bolster. It has coil springs. File:Rollingstock axle.jpg | Railroad car wheels are joined to a straight axle, allowing both wheels to rotate together. This is called a ''wheelset''. File:archbar ACL143.JPG | An archbar-type truck with American style journal boxes that are bolted to ends of the side frame File:Seitenkipper-Ua4201-Drehgestell.jpg | A Bettendorf-style truck with axle boxes, which are not part of the side frames, at the wheels File:Achslager-Nordbahn-Wagen.JPG|A 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 springs and American style journal boxes File:JacobsBogieArticulatedWellCarCanadianPacificTrainBoltonON.jpg|Closeup of a shared bogie with 4 specially adapted side bearings<!-- Not a Jacobs bogie --> and an articulated connector between two sections of an articulated well car. The roller bearings are not enclosed by an axle box. </gallery>
== See also == {{div col|colwidth=20em|style=column-count:2;}} * Axle track * Ball bearings, or roller bearings, which replaced journal bearings for interchange * Glossary of North American railway terms * Glossary of rail transport terms * ICF Bogie * Roller bearings, replaced journal bearings for interchange * Rotation around a fixed axis * Stuffing box * Timmis system, an early form of coil spring used on railway axles * Train wheel * Wheelbase * 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 Truck parts * Category:Car-related lists Category:Wikipedia glossaries using subheadings