美国最快的火车速度是几英里长的东北走廊线那段。最高速度大约是中国火车的一半。
Highest speed is on the Northeast corridor for a few miles, topping out at around half the speed of the Chinese train.
Ⅱ级标准仅对东北走廊线的美铁阿西乐客运快线服务有效，因为阿西乐是美国目前唯一应用Ⅱ级标准运行的客运快线。
The Tier IIstandards only impact the Amtrak Acela Service on the Northeast Corridor because Acela is currently the only Tier II application operating in the United States.
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