The City by the Bay's cable cars are more than just a San Francisco treat, they're the last such manually-operated trolleys in existence. And these massive engines are what keep them chugging up some of the City's steepest terrain.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/4jMEiIhrD10/how-san-franciscos-cable-cars-climb-its-iconic-hills
RED HAT RADISYS RACKABLE SYSTEMS QUEST SOFTWARE
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