“十五”期间铁路的提速目标 ,就是要建成“三个中心” :以北京、上海、广州为中心 ,建成连接主要城市的全国铁路快速客运网 ,总里程约 1 4 0 0 0～ 1 60 0 0ｋｍ ;“三个提速圈” :以中心城市为圆心 ,半径约 50 0ｋｍ的城市间实现朝发夕至 ,半径约 1 2 0 0～ 1 50 0ｋｍ的城市 The goal of speeding up the railway during the Tenth Five-Year Plan is to build “three centers”: Beijing, Shanghai and Guangzhou as the center, to build a national express railway network connecting the major cities with a total mileage of about 140,000-160 0 0km; “Three Speed ​​Rings”: cities with a radius of about 50 km and a radius of about 120 to 150 km