In the jolly good Horizon film about train crashes that Zero pointed out yonks ago, there was one caused by the tablet system, where someone got confused, and handed back the driver the one he'd just handed over, and they didn't check it was the right tablet.
www.youtube.com/watch?v=SxpBzGCKA0w
Last edited by: Crankcase on Wed 17 Feb 16 at 08:08
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