I think it would be pointless issuing a fine as the person would most likely be committed under the mental health act for their own (and others) safety and would be unlikely to be in a position to pay it for some time.
As for many who commit or try to commit suicide you will find that jumping under a train wasn't their first intention and they may have made other attempts by other methods (pills, gas etc.) and they have this image of it being a quick and instant escape from whatever is troubling them.
As for those who think it is a selfish act you just can't fathom what is going through someone's mind when they become blinkered and desperate enough to want to escape the pain of their existence. Many years ago there was a young girl of 17 who had been repeatedly raped and was so traumatised by the event that on the very first occasion she was let out of hospital she went to the nearest tube station and jumped under the first incoming train. It is not one of those things you can come out with a black and white answer to and call people selfish or otherwise without knowing why people have become so desperate that they want to end their lives.
Is suicide selfish...Yes and No...It is selfish to people they leave behind to try and pick, and No, because the person going through with itdoes not believe there worth anything anymore, a depressed mind is horrible, and it is hard to think, make sense and function normally.
I have spoke at length before about my own ordeals before, witnessing a suicide in London, although I was at one end of the platform from where it happened, I saw enough to know what was going on, acts like that are incredibly selfish to the driver, other passengers, the poor b*****d who has to clean it up and family left behind...I myself, am incredibly selfish, tried suicide many times, and thought about Suicide by train, but could bring myself to do it, thoughts of a driver came into my mind, that when I ended trying again, I made my way to Durham Viaduct, sat on the edge, waited for a non-stop train to come through hoping a bit of a draft from it would blow me off the edge...BTP and Durham Police found me and talked me down.
In the past in my mind, I have not been able to think straight, while I have gone through many suicide attempts, I now think back and think that I probably was quite selfish to a point and probably did it to get the help I needed as I felt nobody cared, I nearly got my wish at 15 when I ended up in ICU after an Overdose, doctors did not know how to do deal with me and had never seen anyone react the way I did that day, if the paramedics were 10-20 minutes later I would not be talking about it, luckily I held on and fought for my life...