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.
The unmanned train belonging to the Montreal, Maine & Atlantic railway carrying 72 cars of crude oil slammed into the heart of Lac-Megantic, setting off massive explosions.
A spokesman for the agency says it's had a closer look at 25 tanker cars since gaining access to the blast site two days ago -- and has taken pictures and samples.
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