The Seattle–San Diego route was initially left out of plans for Railpax (later Amtrak) until protests from politicians in California, Oregon, and Washington. With the start of Amtrak operations on May 1, 1971, a single train began running between Seattle and San Diego. The unnamed train (#11/12) ran three days a week; on the other four days, another unnamed train (#98/99) ran between Oakland and Los Angeles. On November 14, Amtrak extended the Oakland–Los Angeles train to San Diego, renumbered it to #12/13, and renamed it Coast Daylight. The Seattle–San Diego train became the Coast Daylight/Starlight (#11-12) northbound and Coast Starlight/Daylight (#13-14) southbound. Both trains were cut back from San Diego to Los Angeles in April 1972, replaced by a third "San Diegan". On June 10, 1973, Amtrak began running the combined "Coast Daylight/Starlight" daily for the summer months. Positive response led to Amtrak to retain this service, and the "Coast Daylight" name was dropped on May 19, 1974.