What? They think he was doing poppers and blowing the throttle lever, or riding on it? I won't even read that wharrgarble.
Anyway, I've read a couple reports mentioning the windscreen showed clear evidence it was damaged prior to the crash, having a circular hole in the lower left corner, with circular crack pattern radiation, like when a rock or bullet hits that type of windscreen. And that quite a few projectile impacts had been reported by other train engineers in the area recently. And the engineer in the crash was reported to have been found unconscious with a head concussion and significant head wound requiring quite a few stitches. And that he reported a windscreen impact on the radio prior to the crash. He may have passed out within moments of his radio report (which he does not remember yet) after an impact to his head.