Who invented the high-speed rail?

China imported high-speed rail technology from Germany, France and Japan, and obtained the right to use the patent of the other side. It is easy to improve the speed, but the improvement of the speed needs various arguments and the influence on the surrounding buildings and even the surface. China only pays attention to speed. You want the technology developed by others, and you have been ahead for so many years (there has been a Shinkansen in Japan for about 70 years). China can only run for a few years at the earliest. Think about it and you will know that there is a problem.