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The world's 14 largest metro systems (photos)
China's crazy customized cars [PHOTOS]
10 challenges for your airline and airport in 2013
New York to London in an hour - by train
Mumbai's monorail cost $450 million. So why is it losing a quarter million a mon...
China developing 600 mph airless maglev high-speed train
Scientists say Fukushima's food is safe. So why aren't the Japanese eating it?
Why carbon capture and storage will never pay off
Five new green technology innovations from the U.S.
Unstoppable! Airless tire will never go flat
Energy independence, or impending oil shocks?
The top 10 worst airports in America