
An articulated vehicle is a vehicle which has a permanent or semi-permanent pivoting joint in its construction, allowing the vehicle to turn more sharply. There are many kinds of articulated vehicles, from heavy equipment to buses, trams and trains. Steam locomotives were sometimes articulated in that the driving wheels could pivot around turns. I...
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http://en.wikipedia.org/wiki/Articulated_vehicle

(from the article `bus`) Articulated buses were first used in Europe in the 1950s. In this arrangement a trailer body is connected to the rear of a conventional front-engine ... Trucks can be classified as either straight or articulated. A straight truck is one in which all axles are attached to a single frame. An articulated ... [4 ...
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http://www.britannica.com/eb/a-z/a/107
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