I'm in scotland Uk
1) Because I have no assisted suicide service
2) No euthanasia option
3) No guns
4) Other options to difficult or painful
5) Train death, if done right, is the closest thing you're doing to get to a quick/painless death.
If I find a way to stand in front of a train doing 60-100mph, and it connects directly with my skull, it would be a miracle if I survived.