. Delivery of the original Superliner 1 cars began in 1979 with the first cars operating on short runs originating in Seattle and Chicago. As more cars arrived, entire Superliner trainsets replaced trains on existing Western routes. The height of a Superliner generally precludes its operating in the Northeast because of tunnel clearance concerns. The Phase IVb is the current operating paint scheme for Amtrak passenger equipment, removing the "SUPERLINER" lettering from the sides of the cars and featuring the new Amtrak logo on the sides of the car.