Fair call, though I hardly think it is impossible to imagine the mindset. They don't have the will to live anymore, period. My viewpoint is admittedly extremely selfish and insensitive. I may have been too overly simplistic about the matter.

Speaking as someone with zero knowledge on the subject, I imagine the big issue is getting the trains to always stop at the correct spot to line up with the platform's doors. I first saw screen doors in Singapore, and for their MRT system the trains are driverless and programmed to stop exactly in the right position. Human error is still the recurring factor for us, and would probably delay trains all the time without an automated system in place.

But yes, I do think screen doors are the way to go. Take the option out of their hands so to speak. If we can lawfully remove guns as an option for suicide, we should work to remove trains as one too. I also think mental health services should be more widespread and far less stigmatised, but how we'd even go about that as a society is another complex matter altogether.