The resulting California Car design, of which 66 were built by Morrison Knudsen from 1994 to 1997, offered a number of improvements on the Superliner design. The single vestibule and bent staircase of the Superliner design were replaced with two vestibules and two straight staircases to facilitate faster loading and unloading. The trainline-controlled power doors do not require a crew member at every door, thus reducing crew size requirements. The California Cars comply with the Americans with Disabilities Act of 1990, with wheelchair lifts and accessible seating on the lower levels. Fourteen of the cars were built as cab cars, allowing push-pull operations rather than turning the whole train or moving the locomotive at terminals.