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Does such a train have a driver or competent person who should be at the controls? I know that in aviation, for instance when a plane is being towed, there must be a competent person at the controls to apply the brakes should something go wrong. Of course, if the plane is taxiing under its own power there would have to be a competent person at the controls without question.
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Hindsight is what you see from the guard's van 
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