Pulling this from an old Caltrans publication:
Didn't want to derail the Spirit of California thread with this, but I found this incredibly interesting and something that would probably provoke a good discussion here.In August 1984, Amtrak contacted Caltrans regarding a proposal to establish an Oakland section of the basic-system Chicago-Los Angeles Southwest Chief. The Oakland section would separate from the main Chief train at Barstow, run to Bakersfield via Tehachapi, then follow the San Joaquin route into Oakland. Caltrans welcomed the idea of an Oakland section of the Chief, since it would provide direct service to the Southwest and Midwest for Valley communities, service which disappeared when Amtrak was established in 1971.
However, Amtrak's schedule proposal was based only on the transcontinental schedule of the Chief and would have required another morning bus connection departure from Los Angeles before 6:00 a.m.. Since local travel needs must be considered in the development of the State's rail passenger program, and since the Los Angeles market is vital to the success of rail service in the San Joaquin Valley, Caltrans could not justify supporting two out of three Valley trains that do not serve Los Angeles at reasonable hours. Accordingly, Caltrans asked Amtrak to consider some modifications to its proposed schedule, in order to serve the needs of both Amtrak's national network and California's local travel markets.