SAN FRANCISCO - JULY 22: Passengers enjoy a ride in a cable car on July 22, 2011 in San Francisco. It is the oldest mechanical public transport in San Francisco which is in service since 1873.
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SAN FRANCISCO - JULY 22: Passengers enjoy a ride in a cable car on July 22, 2011 in San Francisco. It is the oldest mechanical public transport in San Francisco which is in service since 1873.