I can't believe that the professional railwaymen (past and present) on this forum have nothing to say about this scenario.
Come on guys......are you afraid of being contradicted by colleagues?.......Can "trespassing" on the railway, for whatever reason, ever be condoned?......what was the likelihood of the Pandrol clips causing a derailment?
Several years ago when I asked this same question on an American Forum I was inundated with replies.
John.