I would not do a petition, we are supposed to be a community supporting Merlin through this disaster, even if we blame them. You would be adding more grief and work for Varney and the management, and there attention should be focused on working with the families and H&S execs.
So after watching POV's there is no way the train is only doing 20mph when it hit the stationary one, so here's my theory based on this infomation being true.
Is there a possibility that the trim brakes on the first airtime hill just before inversion 5 was increased to reduce the speed further, therefore reducing the impact of the crash?
I don't know if this is possible, but the operator, providing it was left in maintenance mode, would've been able to do that if he knew how to.
Just a thought after watching some POV's, as 20mph sounds ridiculous otherwise.