EXPERT APPROACH WHEN RESEARCHING CAUSES OF TRAMWAYS COMING-OFF FROM RAIL TRACKS (TURNOUTS)
During investigation of road-traffic accidents with tramways participation, investigative bodies are interested in the causes which, from the technical point of view, could lead to coming-off of a tram from rails. In the paper the case in which two drivers of separate tram cars took part, is considered. Circumstances of road traffic accident consist in the following. During transit of the first tram through automated turnout in the moment when the first bogie of the first tram has already proceeded the switch, and the second has not yet, there was shift of a point rail, that is, there was a shift of rail for the movement in other direction. As a result of it the first bogie of the first tram has continued movement in the same direction, and the second bogi has started to move in another direction. In other words there has occurred turnout incut. In order to check operation of a turnout, various modes of its operation were simulated. Also experimental transits of tram cars were carried out. The obtained data has allowed to draw up a conclusion that the cause of the first tram coming-off from rails was a technical malfunction switch and coincidence of certain circumstances. That is, on the one hand, automatic moving ofpoint switch occurred only for tram movement to the left. On the other hand, the reason of the first tram descent from a railway was that the driver of the second tram has passed entrance harp during the moment when the first tram still was in a pass stage of switch. In article the algorithm of the specialist actions in a similar situation during carrying out of investigatory experiment is resulted and the list of questions solved at carrying out of switch researches, which works in an automatic mode at the moment of traffic accident occurrence is stated.
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