1.1April 0, 997 at 0: 001,the first railway speed-up surveying and mapping was fully implemented, which opened the prelude to the railway speed-up;

2. 1 9981:001October1day, the second large speed-up map adjustment of China Railway began to be implemented;

3. On June 0, 2000, 65438+1October 2 1, the third large-scale speed increase of China Railway was successfully implemented in Longhai, Lan Xin, Beijing-Kowloon and Zhejiang-Jiangxi lines;

4.200 1 year 1 year 2 1 hour, after full preparation, the fourth high-speed surveying and mapping of China Railway began to be implemented;

5. The fifth large-scale speed-up mapping implemented at 0: 00 on April 18, 2004;

6. At 0: 00 on April 18, 2007, the passenger capacity of China Railway will increase by 18% after the sixth speed increase.