What would be the reason for the near 100 mph situation?
I don’t know the track or the train at all. Perhaps, just prior to the turn he was allowed to travel 100 mph. If he’s in a state of hypnosis, he may not have been able to think about watching his speed.
This question needs to be answered.
Same reason as the "German Wings" Airplane crash. A Despondent Homosexual felt the need to kill himself and his passengers, so he increased speed to crash the train.