Special flanged steel wheels are behind the rubber-tired running wheels, with additional horizontal guide wheels in front of and behind the running wheels, as well. The unusually large flanges on the steel wheels guide the bogie through standard railroad switches , and in addition keep the train from derailing in case the tires deflate. To overcome breaks of gauge some bogies are being fitted with variable gauge axles VGA so that they can operate on two different gauges.
The Cleminson system is not a true bogie, but serves a similar purpose. It was based on a patent of by James Cleminson,  and was once popular on narrow-gauge rolling stock, e. The vehicle would have three axles and the outer two could pivot to adapt to curvature of the track. The pivoting was controlled by levers attached to the third centre axle, which could slide sideways.
Some tanks and other tracked vehicles have bogies as external suspension components see armoured fighting vehicle suspension.
This type of bogie usually has two or more road wheels and some type of sprung suspension to smooth the ride across rough terrain. Bogie suspensions keep much of their components on the outside of the vehicle, saving internal space.
Although vulnerable to antitank fire, they can often be repaired or replaced in the field. An articulated bogie is any one of a number of bogie designs that allow railway equipment to safely turn sharp corners, while reducing or eliminating the "screeching" normally associated with metal wheels rounding a bend in the rails.
There are a number of such designs, and the term is also applied to train sets that incorporate articulation in the vehicle, as opposed to the bogies themselves. If one considers a single bogie "up close", it resembles a small rail car with axles at either end. The same effect that causes the bogies to rub against the rails at longer radius causes each of the pairs of wheels to rub on the rails and cause the screeching. Articulated bogies add a second pivot point between the two axles wheelsets to allow them to rotate to the correct angle even in these cases.
In trucking , a bogie is the subassembly of axles and wheels that supports a semi-trailer , whether permanently attached to the frame as on a single trailer or making up the dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer as when pulling doubles or triples. Radial Steering Trucks, also known as Radial Bogie Trucks, are a somewhat experimental version of wheel assemblies found under almost all modern railway rollingstock; this generally excludes historic 2Axle wagons and steam locomotives e.
For non-radial standard bogie trucks, the more axles in the assembly, the more difficulty it has negotiating curves, due to wheel flange to rail friction. For radial bogie trucks, the wheel sets actively "steer" through curves, thus reducing wear at the wheel flange to rail interface and improving adhesion; various radial designs are depicted and described below.
However, the HTCR in actual operation had mixed results and relatively high purchase and maintenance costs. However it also met with limited acceptance due to relatively high purchase and maintenance costs, and customers have generally chosen GE HiAd standard bogie trucks for newer and rebuilt locomotives.
Bogie of an SBB Eurocity passenger car, as seen from underneath. Anheuser-Busch refrigerated rail car on archbar freight trucks.
North American Bettendorf -style "Three Piece Bogie" freight car "truck" with now obsolete journal bearings in now obsolete journal boxes   displayed at the Illinois Railway Museum. It has coil springs. A journal box  no longer used on North American railways  . Closeup of a bogie, aka. The axle bearings are not enclosed by an axle box.
Bettendorf -style "Three Piece Bogie" with axle boxes. I just stopped to pee and that rest stop is swarming with prostitutes. Want more of the world's best Cars delivered straight to your inbox? Click here to sign up for our daily email. Aaron Miller is the Cars editor for Thrillist, and can be found on Twitter. Give him a clean shot through the woods and he'll be hammer down and happy. Tastefully modified, with a stance that smacks you across the face with an open hand.
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