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.
Det hedder "bullet" toget fordi det var afrundet foran, men hver gang den kørte ind i en tunnel opbyggede den en trykbølge, og så ville den skabe et overlydsbrag når den kom ud.