I dop not know, just reported on what some expert was saying on Fox news. He speculated on the possibility.
I may not have understood his explanation, but I thought he said there was only one lever.
Who knows... we will probably hear all kinds of speculation before this is over.
If these lever or levers are somewhat vertical I suppose it is possible the engineer slammed into them accidentally either panicked or literally hit with a flying object, but it would depend how the control boards are situated which I have no idea.
The simplest explanation is that train was cruising at 100 MPH
and the gay engineer did not slow the train before the curve.