A detailed, easy-to-use map of the high-speed rail network produced by a college lecturer has proved to be a big hit on the Internet.

Millions of people have consulted the map since Tao Anjun, 30, uploaded it in January last year.

It shows the routes of all 77 high-speed lines in more than 30 colors, and it includes useful information such as the distances between stations. There are no official maps that are as comprehensive or user-friendly.