Originally intended for the poor, the land located atop or along the slope of the city's hills was eventually taken over by wealthier families once cable car service was introduced there. This means of transpiration, invented in 1874 by Andrew S. Hallidie, is pulled by a powerfully underground cable capable of moving a car uphill at a constant speed of 9 mph (15 km/h). In 1889, there were eight city routes covering a total of 112 miles (180 kilometers). Today, there are but 40 cable cars operating along three routes that transport over eight million passengers annually.
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