Wouldn't recommend. You can't guarantee that you won't end up severely disabled.
I know someone that is severely disabled, because of jumping off a bridge. A very high bridge. They picked the highest local one, in the entire county and it is fucking HUGE. I went up there myself a couple of times, and fuck. I believe they're the third person to ever survive that bridge, and there's been a lot - see?
The specialist doctors had never seen anyone survive that height, nor those injuries - this person was the first in their career. It was horrific, but they are still alive and they are 10x worse off than they were before.
Their life is 100000x worse than it was, put it that way. No doubt, they wish they hadn't jumped because their mental health would not be as bad as it is now, nor would they be severely disabled. Brain damage and other list long injuries, lists, and lists actually.
I'm not going to list their injuries, or any of that shit, because I'm still traumatised by it myself as it was someone I loved very dearly (and I still do), and I saw them an hour before they did it (the last fucking person that knows them, unlike the people that saw them jump), and straight after, when they were all tubed up in the hospital.
Trust me, you don't want to fucking jump. People have survived much higher, too. You cannot predict this shit, look - even the doctors were in disbelief how this person survived.
I also know of two (that died), one intentional, one not.
Second person jumped from the the top of the inside of a shopping centre, straight onto marble flooring. A friend told me about this one (it was fairly recent actually). She was really fucked up (physically from jumping), you can probably imagine... anyway, she didn't die instantly. All the people were fucking traumatised (just like the first person I mentioned, because they saw them jump and tried to stop them!), and this lady took er, I think about 10 minutes to die. Can you imagine the pain? She was twitching and everything. Horrific
Third one was really drunk, and as per usual, messing around on roofs with his mates. He was a decent person, I met him actually years before it happened. It was really sad - over being drunk and deciding to do that? He was young and thought no harm would come to him, if he was fucking about on a ROOF of a shop. If I remember correctly, the shop was 2 floors-ish high. Anyway, he fell and died.
Fourth person, not jumping related, but she fell, hit her head on a curb, now severely disabled.
The choice is yours. I used to think about jumping, until it happened to the first person years ago. Now I would never consider it. Ever. Doesn't matter how high, because you have absolutely no guarantee you're going to die.
Naturally, the doctors will save you. People will try to save you because it is human instinct, and you can't consent, so you're fucked basically. And there is absolutely no way you would NOT have severe injuries - including brain damage - for the rest of your life. You wouldn't be able to end your life due to severe brain damage/physical lifelong injuries, and euthanasia would be out of the question due to capacity issues.
Do you want to end up severely disabled is the question you should be asking yourself. Especially locked in syndrome.
As for the train method - do you really want to traumatise people for the rest of their lives? You know what it's like to suffer, now why would you wish that on someone else, because YOU are deciding to end your life? Please think about that.