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Wire-cable manufacturer Andrew Hallidie conceived the idea after witnessing an accident in which a horse-drawn carriage faltered and rolled backward downhill dragging the horses behind it. The first cable car to descend down Clay Street on Nob Hill was an immediate success. Besides creating a vital link in San Francisco's public transportation system, the cable car opened the door for building on steep hills which until this time was thought to be impossible. Throughout the 1890s, eight transit companies operated 600 cars which covered 21 cable car routes and a total of 52.8 miles. Cable cars remained the primary mode of transportation until the 1906 earthquake.
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