SAN FRANCISCO - 20 AUG: Passengers enjoy a ride in a cable car on August 20, 2011 in San Francisco. It is the oldest mechanical public transport in San Francisco that has been in service since 1873. - stock photo
SAN FRANCISCO - AUG 20: Passengers enjoy a ride in a cable car on August 20, 2011 in San Francisco. It is the oldest mechanical public transport in San Francisco which is in service since 1873. - stock photo