FILE- In this Dec. 8, 2011 file photo, the Amtrak Downeaster travels through Portland, Maine. Amtrak is going to break the speed limit in the Northeast Corridor. The rail service announced Monday, Sept. 24, 2012,  it will operate test trains overnight at 165 mph in four stretches from Maryland to Massachusetts. (AP Photo/Robert F. Bukaty, File)
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