Explosion

I got on the train around the 5th junction, and made my way up the floors to the 3rd level. There I met a few friends and we got to chatting, when we heard the loud explosion up ahead. The train came to a halt, and there was an announcement about the station ahead of us.

Later, I got on the train on the opposite side, and witnessed an identical explosion going the opposite way... except it was the same explosion, I was on both trains at the same time...