The answer to this is that if someone were to lie on the track, it will decapitate the person, or at least chop them into pieces (depending on how they position themselves); that the likelihood of them surviving is little to zero. As they will stay under the train or at least get stuck. If they survive, they will be.... all mangled up. It would be a miracle if they do survive, but if they do, I think u can imagine how they'll be
But by jumping in front of it, the impact could either throw the person off, hitting random body parts, but still giving them permanent life-long injuries. I knew a young chick who was permanently paralyzed after her attempt :( . There is more survival rate with this one, BUT with life-long physical repercussions, could also get TBI/brain damage.
The diff is like being guillotined/steamrolled onto by an intense mass (cannot escape) VS being catapulted into at a high velocity (could be flung)
All in all, imo this method shouldnt be a consideration to anyone. High risk, very public, the train driver would feel like theyve killed you (if one did die), very violent & brutal to unsuspecting bystanders (esp kids). And if one survives, we'd be incapacitated for life. Everyone gets PTSD for life
Ngl, I've thought about it heaps when I was younger (and still do entertain the thought sometimes), but taking into considerations all of the above, especially it being very public (I dont wanna be in the news, I just want some privacy and die alone lol), risk of traumatizing other people AND selfishly, fear of being paralyzed for life or vegetative deterred me.
But I can understand, if someone got to that point, they must have been feeling really desperate.