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Cable-car tram. San Francisco, USA, showing the underground cable used to pull the tram. Such light urban railways can provide a rapid means of transport around cities. The cable car was made possible by Andrew Hallidie's 1869 invention of a grip that could grasp a continuously running cable. A cable car tram system was introduced to San Francisco in 1873 because the city's steep roads meant that the wheels of a self-powered tram could not get enough grip on the rails to drive it uphill.
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