Uni-directional vehicle

You can help expand this article with text translated from the corresponding article in German. (January 2016) Click [show] for important translation instructions. View a machine-translated version of the German article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 1,975 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:Einrichtungsfahrzeug]]; see its history for attribution. You may also add the template {{Translated|de|Einrichtungsfahrzeug}} to the talk page. For more guidance, see Wikipedia:Translation.

You can help expand this article with text translated from the corresponding article in Dutch. (January 2016) Click [show] for important translation instructions. View a machine-translated version of the Dutch article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 207 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Dutch Wikipedia article at [[:nl:Eenrichtingsvoertuig]]; see its history for attribution. You may also add the template {{Translated|nl|Eenrichtingsvoertuig}} to the talk page. For more guidance, see Wikipedia:Translation.

A uni-directional vehicle is a vehicle that is normally designed to operate only in the forward direction. While the vast majority of road vehicles are like this, the term generally refers to a train or tram with a distinguishable front and rear end and a single operating cab at the front end. These vehicles often have the capability to operate in reverse, though such operations are limited to low speeds and short distances, such as shunting.

Uni-directional vehicles commonly have entry and exit doors on only one side of the vehicle (usually the sidewalk side), although some are equipped with doors on both sides, or operate in opposing traffic flow, to facilitate the use of island platforms. Having doors on only one side allows for an increase in seating on board the vehicle, compared to bi-directional vehicles which have doors on both sides.

Because a uni-directional vehicle can only travel in one direction they require special infrastructure for turning around at a terminal station. This is usually a balloon loop on tram systems, which mainline railways tend to use a triangle junction or turntable.

Unidirectional trams and streetcars operate in many parts of the world, with a significant number running in Continental European cities such as Rotterdam, Amsterdam, Zurich, Berlin, Düsseldorf, and Vienna.

In Asia, uni-directional vehicles can be found in Hong Kong (both tram and light rail) and Kolkata. In North America, modern uni-directional streetcars operate in Toronto and Philadelphia, while historic uni-directional streetcars can be found in San Francisco, Philadelphia and El Paso.

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