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File:Why London Underground is nicknamed The Tube.jpg

English: The nickname "Tube" comes from the almost circular tube-like tunnels through which the small profile trains travel. This photograph shows a northbound Northern Line train leaving a tunnel mouth just north of Hendon Central station.
Italiano: Il soprannome "Tubo" si deve alle gallerie circolari simili a tubi dentro la quale ridotta sezione viaggiano i treni. Questa fotografia mostra un treno della Northen Line diretto a nord uscire dalla imbocco della galleria poco a nord della stazione centrale di Hendon.
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