“十五”期间铁路实施提速的目标概括起来说 ,就是要建成“三个中心”、“三个提速圈”。“三个中心”,就是以北京、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 ,总里程达 140 0 0 km～ 16 0 0 0 km左右 ;“三个提速圈”,就是以中心城市为圆心 ,半径在 5 0 0 km During the “Tenth Five-Year Plan” period, the goal of speeding up the implementation of the railway system can be summarized as “three centers” and “three speeding laps”. The “three centers” are based on Beijing, Shanghai and Guangzhou as the center, to build a national rapid transit passenger network connecting the major cities with a total mileage of 140 0 0 km ~ 16 0 0 km. The “three speed circles” is The center of the city as the center, a radius of 500 km