Introduced by Amtrak in April 1989, the Horizon fleet (also known as the Amfleet IIIs) were based on the Pullman-Standard Comet-series commuter cars built since 1970. The new Horizon fleet consisted predominantly of two basic car types - Coach and Dinette - with 86 and 18 cars respectively forming the 104-car order placed with Bombardier.
An Amtrak Classic
Over the years, the Horizon cars have remained largely unchanged from their as-built appearance, with the only predominant visual differences being the evolution of the Amtrak paint schemes from Phase III through Phase VI. However, two key changes that have occurred include the replacement of the original power sliding doors with manually-operated parlor doors, and the replacement of the fold-down stairs with fixed steps.