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Three cable lines are still active in SF and these are as follows: California and the two Powell Cable Lines. The last two are most popular among locals and tourists as they even travel to the sheer area in the north, including the Lombard Street. Riding these cars can be pretty fun, but lines tend to be long at times especially during late mornings and afternoons.
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Jennifer Bean (San Francisco Travel Guide: Top Attractions, Hotels, Food Places, Shopping Streets and Everything You Need to Know)