 Amtrak took over most intercity passenger operations in the United States on May 1, 1971.Amtrak did not continue service to the San Joaquin Valley, but Martinez was served by the Seattle–San Diego "Coast Daylight/Starlight" (later the "Coast Starlight") and the Oakland–Chicago "City of San Francisco" (later the "San Francisco Zephyr" and "California Zephyr").The Oakland–Bakersfield "San Joaquin" began service on March 5, 1974, with a stop at Martinez.