AMTRAK CAR is a term used to refer to the passenger RAIL cars operated by Amtrak, the national RAIL system of the United States. The three crossword solutions for this term are DINER (5 letters), ACELA (5 letters), and RAIL (4 letters). DINER refers to the type of car that provides passengers with meals during their journey. ACELA is the name of Amtrak's high-speed train service, which operates on the Northeast Corridor between Washington, D.C. and Boston. Finally, RAIL is a reference to the fact that Amtrak operates on a network of railway lines across the country.