The Sunset Limited is a long-distance passenger train operated by Amtrak on a 1,995-mile (3,211 km) route between New Orleans, Louisiana, and Los Angeles, California, with major stops in Houston, San Antonio, El Paso, and Tucson. Introduced in 1894 by the Southern Pacific Railroad, it is the oldest continuously operating named train in the United States.

The Long Distance Service Line is the division of Amtrak responsible for operating all intercity passenger train services in the United States longer than 750 miles (1,210 km). There are fifteen such routes as of 2023, serving over 300 stations in 39 states.