At least try and jump in front of train without passengers, that way only one person has to be traumatized. Harm reduction and all that.
I've actually been on a train that hit somebody.
I visited America and was riding the Amtrak into LA at a fair speed, maybe 60-70mph. Suddenly the train broke with all its force and we just sat the for ages not knowing why, then a police team came down the side of the train and started looking under our carriage. Not sure if it was suicide or not, i guess it probably was.
I was also coming home from work one night at Gatwick airport rail station when our train was delayed as someone had jumped in front of another train, but i did get the pleasure of seeing them wheel a body bag down the platform.
Neither incident was remotely traumatising tbh - though i can't speak for the driver who now has to live with those images for his whole life. However, both instances were frigging inconvenient, and you can multiply that inconvenience by every person on the train. A 2 hour delay on a train with 300 people on it is a almost a month of delay in total.