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running rail /ˈɹʌnɪŋ ˈɹeɪl/ n

中文：走行轨

中文 · 走行轨Español · raílFrançais · rail et retour de courant
Meaning：Regular railroad rail for the steel safety wheel to roll on in the event the tire deflates; it also receives the traction current from the return shoe.
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Subway bogie and track

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