The San Diego Trolley system consists of three light rail lines: the Blue Line, the Green Line, and the Orange Line. Each line serves a different route and provides access to different parts of the San Diego area. The Blue Line runs from Old Town to downtown San Diego, the Green Line runs from Santee to downtown San Diego, and the Orange Line runs from El Cajon to downtown San Diego. You can find more information about the San Diego Trolley and its routes on the San Diego Metropolitan Transit System website.
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