Editing Bogie (section)

===Components===
{{Main| List of railroad truck parts}}
[[File:Railroad truck, FM55-20.Fig8-8.png|thumb|A diagram of an American-style truck showing the names of its parts and showing the [[journal box]]es to be integral parts of the [[Truck side frame|side frame]].<ref>{{cite web|url=https://patents.google.com/patent/US1924237A/en|title=Bogie truck for railway and like vehicles|website=google.com|access-date=8 May 2018|url-status=live|archive-url=https://web.archive.org/web/20180508093532/https://patents.google.com/patent/US1924237A/en|archive-date=8 May 2018}}</ref><ref name="col">{{Cite web |title=AAR M-1003 Certified Truck Component Manufacturing |url=http://www.columbuscastings.com/bolster_frames.html |url-status=dead |archive-url=https://web.archive.org/web/20141019033202/http://www.columbuscastings.com/bolster_frames.html |archive-date=2014-10-19 |access-date=19 November 2014 |website=ColumbusCastings.com |publisher=Columbus Castings |location=Columbus, Ohio}}</ref><ref name="SCT">{{Cite web |date=January 2000 |title=General Information |url=http://www.sctco.com/pdf/sect_1.pdf |url-status=dead |archive-url=https://web.archive.org/web/20160304045504/http://www.sctco.com/pdf/sect_1.pdf |archive-date=4 March 2016 |access-date=19 November 2014 |website=SCTCO.com |publisher=Standard Car Truck Company}}</ref> The journal boxes house [[plain bearing]]s.]]
Key components of a bogie include:<ref name="how" />
* The bogie frame: This can be of inside frame type where the main frame and bearings are between the wheels, or (more commonly) of outside frame type where the main frame and bearings are outside the wheels.
* [[suspension (vehicle)|Suspension]] to absorb shocks between the bogie frame and the rail vehicle body. Common types are [[coil spring]]s, [[leaf spring]]s and [[rubber]] [[Air suspension|airbags]]. 
* At least one [[Wheelset (rail transport)|wheelset]], composed of an axle with [[Bearing (mechanical)|bearings]] and a wheel at each end.
* The [[List of railroad truck parts#Truck bolster|bolster]], the main crossmember, connected to the bogie frame through the secondary suspension. The railway car is supported at the pivot point on the bolster.
* Axle box suspensions absorb shocks between the axle bearings and the bogie frame. The axle box suspension usually consists of a spring between the bogie frame and axle bearings to permit up-and-down movement, and sliders to prevent lateral movement. A more modern design uses solid rubber springs.
* [[Brake (railway)|Brake equipment]]: Two main types are used: [[brake shoe]]s that are pressed against the tread of the wheel, and [[Disc brake#Railroad and tram use|disc brakes]] and pads.
* In powered vehicles, some form of [[Transmission (mechanics)|transmission]], usually electrically powered [[traction motor]]s with a single speed gearbox or a hydraulically powered [[torque converter]].

The connections of the bogie with the rail vehicle allow a certain degree of rotational movement around a vertical axis pivot (bolster), with side bearers preventing excessive movement. More modern, bolsterless bogie designs omit these features, instead taking advantage of the sideways movement of the suspension to permit rotational movement.<ref name="how" />

==== Locomotives ====
===== Diesel and electric =====
{{Main|UIC classification of locomotive axle arrangements|AAR wheel arrangement}}
Modern [[diesel locomotive|diesel]] and [[electric locomotive|electric]] locomotives are mounted on bogies.  Those commonly used in North America include [[AAR type A switcher truck|Type A]], [[Blomberg B|Blomberg]], HT-C and [[Flexicoil]] trucks.<ref>{{cite web|url=http://www.hosam.com/emd/emd6a.html|title=trucks|website=www.hosam.com|access-date=8 May 2018|url-status=live|archive-url=https://web.archive.org/web/20160409141649/http://www.hosam.com/emd/emd6a.html|archive-date=9 April 2016}}</ref>

===== Steam =====
On a [[steam locomotive]], the [[Leading wheel|leading]] and [[trailing wheel]]s may be mounted on bogies like [[Bissel truck]]s (also known as ''pony trucks''). [[Articulated locomotive]]s (e.g. [[Fairlie locomotive|Fairlie]], [[Garratt locomotive|Garratt]] or [[Mallet locomotive|Mallet]] locomotives) have '''power bogies''' similar to those on diesel and electric locomotives.

==== Rollbock ====
{{main|Rollbock|Transporter wagon}}
A rollbock is a specialized type of bogie that is inserted under the wheels of a rail wagon/car, usually to convert for another [[track gauge]]. Transporter wagons carry the same concept to the level of a [[flatcar]] specialized to take other cars as its load.

==== Archbar bogies ====
In archbar or diamond frame bogies, the [[List of railroad truck parts#Truck side frame|side frames]] are [[metal fabrication|fabricated]] rather than [[cast steel|cast]].
<gallery mode="packed" heights="160px" caption="Archbar bogie pool">
File:Oigawa-Archbar-Truck.jpg|Japanese archbar bogie with [[axlebox]]es
File:Diamond Frame bogie (elliptical).jpg|Diamond frame bogie, [[elliptical spring]]s and American style [[journal box]]es
File:Diamond Frame bogie (coil).JPG|Diamond frame bogie, [[coil spring]]s and [[journal box]]es
File:archbar ACL143.JPG |Archbar bogie with [[journal bearing]]s in American style journal boxes, as used on some steam locomotive tenders. Archbar bogies (trucks) were also used on [[Railway car#Freight cars|freight cars]].
</gallery>