Cameron also revealed that in the process of the post-mortem exam, the coroner’s office also looked into toxicology. Cameron said “there were no drugs of any kind” in her system. As for the circumstances of the accident itself, the inquest was told that Dallaire-Vincent was operating one underground train, while her partner Charlène Corbeil operated the other train. As locomotive operators, they would take turns loading their trains with ore and then rolling out on a 1,480-metre run to the ore pass, near the central shaft, to dump their trains. Dallaire-Vincent had loaded her train and was waiting her turn to go to the ore pass. This meant waiting for the other train to arrive back from dumping. As part of the process, she had parked her train on the left side-switch, which would allow the returning train to go to the right side-switch. The problem was that for some reason Dallaire-Vincent had not returned the track switching device back to the right side. It was her responsibility to do that. There was no firm evidence given as to why this happened. One theory was suggested that Dallaire-Vincent simply became distracted and forgot about the switch. To make things worse, the operator of the second train had no way of knowing the switch was in the wrong position. Dallaire-Vincent was parked on the left side track waiting for the second train. She had gotten out of the locomotive and was standing on the tracks, her back to the switch.

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