https://en.wikipedia.org/wiki/2015_Philadelphia_train_derailment https://en.wikipedia.org/wiki/2015_Philadelphia_train_derail... dead man's switches don't acti

https://en.wikipedia.org/wiki/2015_Philadelphia_train_derailment https://en.wikipedia.org/wiki/2015_Philadelphia_train_derail... dead man's switches don't activate when the engineer is simply distracted.