This is possibly a stereotype, but I've read that the rail companies discourage people from suicide-by-train with the argument that they'd inconvenience society.
(...which is awfully close to my (possibly equally stereotypical) opinion of why Japan has a suicide problem)
Not only that, but popular stations have barriers which are erected between the platform and the track. Whether these are there to prevent suicide or merely stop someone from falling onto the track, I don't know.
(...which is awfully close to my (possibly equally stereotypical) opinion of why Japan has a suicide problem)