a type of US train run by Amtrak. It is mainly used over long distances west of Chicago. Superliner carriages have two levels with large windows for passengers to enjoy the views, and there are also Superliner Sleeping Cars. 超级班轮:美国铁路公司(Amtrak)运营的一种美国火车。它主要用于芝加哥以西的长途运输。超级班轮车厢有两层,有大窗户供乘客欣赏美景,还有超级班轮卧铺车厢。