- The National Railroad Passenger Corporation, doing business as AMTRAK, is the national passenger railroad company of the United States - It operates intercity rail service in 46 of the 48 contiguous U.S. states and three Canadian provinces - Amtrak is a portmanteau of the words America and track - There are two AMTRAK stops in southern Arizona: Benson and Tucson - There are currently (2026) six AMTRAK "Sunset Limited" trains stopping in southern Arizona ... 3 west-bound on Sunday, Tuesday, and Thursday evenings; 3 east-bound on Monday, Wednesday, and Friday mornings Website ==> https://www.amtrak.com/home.htm