I've seen the start and speed of the Shinkansen on the Youtube channel before going to bed. It is about 8 wagons long and reaches between one leg and another the speed of 500 m/h. On the internet I found a map of this train (open the following link to see https://www.japan-guide.com/g16/2018_04_1603.gif ) in a few words it crosses Japan from South to North, isn't it super? I leave you the train link so the manufacturers know how to rely on future design: Translated with www.DeepL.com/Translator