Which rail line provides the most direct route from San Antonio to Los Angeles?

The most direct rail route from San Antonio to Los Angeles is provided by Amtrak's Sunset Limited service. This train travels westward, connecting San Antonio to Los Angeles with a few stops along the way, including major cities like El Paso and Tucson. Passengers can enjoy scenic views of the southwestern landscape during the journey. However, it's advisable to check the schedule and availability, as routes and services may vary.