The Market Street Railway Company thrived in an age when rails ruled San Francisco. Spanning the Roaring Twenties, the Great Depression, and the boom times of World War II, it had a long and legendary lifetime that is deeply ingrained in the city's early identity. Gradually, however, it became challenged by the emergence of the automobile, cheaper motor coaches, and "nickel jitneys"--competing cars on the same routes. The MSRy painted the fronts of its cars white to show up well in San Francisco's misty weather, and for many years people called them "the White Front cars." Franchise...