It was called the bullet train because it was rounded in front, but every time it went into a tunnel it would build up a pressure wave, and then it would create like a sonic boom when it exited.
To sauca par lodes vilcienu, jo tam bija noapaļots priekšgals, taču ikreiz, iebraucot tunelī, izveidojās spiediena vilnis, kas savukārt radīja  milzīgu skaņas vilni izbraucot.