Beginning in 1900, California shifted away from a rail-based transportation system to one based on automobiles and busses because of their flexibility, lower costs and their capability of supporting far-flung, decentralized cities.
Los Angeles' Pacific Electric Railway stood out as the exception. Its extensive system carried over 100 million passengers by 1945. But by the 1950s, it too fell victim to disuse and to buyouts by oil, bus and auto companies.
Over time, however, the dismantling of these inter-urban rail systems throughout much of California placed an even greater burden on the state's growing network of roads.