Two killed by Metra Train on Chicago's West Side

[Jochs]

Earlier this week, two people walking along the Metra Tracks were hit and killed by a train.
http://www.chicagotribune.com/news/loca ... story.html

When you read the story, you might think "Why do they have to do such an investigation why people died when a train ran them over? Isn't it obvious?"
I think it is standard procedure to do a thorough investigation whenever there is a fatality.