As someone who has faced this possibility, here are my thoughts. I was brought into this world where many things exist that can hurt me, like stepping in front of a bus by accident. The way I see it, people eat animals, there is war, starvation, disease, etc... and jumping in front of a train seems to be a rather small act when compared to the chaos of the lives of approx 8 billion hoomans.
I've been to places, in the dark of night (this was many years ago) on a trainline where there was a small gate for crossing where high speed trains move through the countryside. I remember thinking, it was so dark, the track was so accessible, the train would probably never feel the bump of hitting me. I think now, if there was any feeling in the train, it might feel like a fox or dear was hit. It would be so dark and so late in this secluded area, I don't think much disruption would happen.
I have read about drivers who suffer after incidents... it's impossible to do without it being a genuine accident, for the sake of the driver... but... if he thought he hit an animal in the small hours of the night in the middle of nowhere speeding at full steam towards the city stations... would it be the same? As opposed to a person? Probably... people are wired differently about people... society has created such a stigma over human life and the guilt is almost societal guilt...
But, sometimes, I still think a method is a method... it's the CTB'ers fault... no one elses... if someone happens to be driving the proverbial bus... it's not their fault...
Also driverless trains exist...
It's hard to say... if someone did it... (which people do, it happens in 3rd world countries a lot), they did it... but yeah I wouldn't want to make someone else feel responsible like it was their fault I suppose.