After 3 plus years living in Japan and traveling on trains, I have grown accustomed to trains being late for various reasons. Sadly, the most common reason is suicide. Many people chose to end their lives by jumping in front of trains as they are pulling into the station.
The JR (Japan Railway), the rail line I use most often in the Kansai area deals with this problem a lot. Some stations have digital information signs that explain to you why a train delay has occurred and what lines are affected. I took this picture in Akashi Station with my phone.
Human Damage Accident = Suicide