 Webb had also proposed there had been attitudes that the driver was completely in charge of the train, and speeding was not an acceptable reason for the guard to slow or halt the train, which would have been a contributing factor in the accident.Prior to this derailment, neither training nor procedures mandated the guard to exercise control over the speed of the train by using the emergency brake pipe cock ("the tail").Apart from the driver being considered to be the sole operator of the train, the emergency brake pipe cock does not provide the same degree of control over the automatic brake as a proper brake valve.