According to the scientific police [forensics] in the automatic train control system of the Siemens ZSI-27 unit involved in the accident, from June 20 to July 3 of 2004 "one can repeatedly read the activation of the emergency braking because of excess speed". Most often this happens for "exceeding the established speed by 9 to 10 Km/h", but in others this happens "without reaching this limit". Therefore, the General Directorate of the POlice concludes that "this emergency braking has been activated on occasion without exceeding the limiting speed, which might lead to questioning the system's precision". The report continues by explaining that "it will be possible to discard the fainting of the driver", because the automatic mechanism of the train, denominated "dead man", hasn't been activated as can be gleaned from the data obtained from the Event Recording Box Teloc 2200, also known as black box.