Due to the consideration of fragile security, and longer check-in times and inconveniences due to increased air travel security examination since September 11* 2001, more and more people have turn to ground transportation.Unfortunately, the inefficient, environment-unf+iendly and unsafe passenger cars and buses are the only choices available for middle distance trips. Development of high efficiency, clean and high speed railroad passenger transportation system has become more necessary to overcome this weak link.
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