A forth grade in elementary school stopped 2 trains.

In the morning of 14th, 2 trains were urgently stopped because one boy pressed an emergency button. He was a forth grade student in elementary school. He said that he did this as a mischief. The two trains stopped for 4-6 minutes, and nobody was injured fortunately. I think that he is old enough to know what he should not do. His parents should tell him what an emergency button is for and how bad the thing he did was. One thing which was good about this news was that there was nobody hurt.