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.

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。

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Kulm says Amtrak's Acela is already competing with the airlines.

VOA: standard.2010.02.15

Let me say of myself and almost everyone I know in the press, all the chattering classes and political strategists and inside dopesters of the Amtrak Acela Line: We live in a bubble and have around us bubble people.

WSJ: Open Mic Night at MSNBC

Amtrak says its Acela Express and Northeast Regional Service between New York and New Haven are indefinitely suspended.

WSJ: How the Conn. train crash will affect commuters

On Dec. 14, while he was riding Amtrak's Acela train from New York to Washington, he opened an e-mail that detailed problems in the auction-rate markets, which were seizing up because of the blossoming credit crisis.

FORBES: Legal