Book excerpt: In an unusually systematic approach to the study of urban politics, this study compares three different models of political power to see which can best explain the development of the Bay Area Rapid Transit System in San Francisco and the attempts of Los Angeles to build a comparable system. Originally published in 1982. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.