What is "amfleet"

Amfleet is a fleet of single-level intercity railroad passenger cars built by the Budd Company for Amtrak in the late 1970s and early 1980s. Budd based the Amfleet design on its earlier Metroliner electric multiple unit. They were the first new locomotive-hauled cars ordered by Amtrak. As of 2015, Amfleet cars are used extensively in the eastern and mid-western United States, forming the backbone of Amtrak's single-level fleet.