Officials say excessive speed and lack of braking caused an oil train to slam into a town in Quebec on July 6 and killed 50 people, several of whom have yet to be identified because they were nearly incinerated in the explosion and intense heat.

Donald Ross, chief investigator for the Transportation Safety Board of Canada, said Friday the insufficient brake force could be due to mechanical problems with the handbrakes, or a problem with the way someone applied them.

Forty-two bodies have been located so far. Just over half — 22 — have been identified. The first named victim, 93-year-old Eliane Parenteau, was identified by her jewelry and a metal plate near her hip. Read more here