High-speed rails(HSR)are playing an important role in the transportation systems across the world.In Japan,the Shinkansens carry more than 250million passengers each year.In Europe,the trans-European high-speed rail network is in operation.At the beginning of 2011,U.S.President has called for a six-year,$53 billion budget for HSR.By the end of 2016,China has built the world’s largest HSR network of over 22,000 km.
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