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Rail is also used as part of the evacuation, but most people will want their car so they can carry enough supplies to last for the evacuation period. In fact one of the most egregious aspects of the Katrina disaster was New Orleans explicitly told Amtrak their trains were unnecessary [1].

>"We offered the city the opportunity to take evacuees out of harm's way," said Amtrak spokesman Cliff Black. "The city declined."

[1] http://www.washingtonpost.com/wp-dyn/content/article/2005/09...