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Conservative estimates suggest that without Amtrak, air passengers on the NYC/Washington, D.C. route would increase 36%. Chicago's O'Hare airport -- the world's busiest -- handles 60 million passengers each year. Paris' St.-Lazare station handles 150 million passengers in only a fraction of the space. 500 km of the French high-speed train system could fit on the land occupied by one large airport. Worldwatch Institute 
