Brake force blamed in Canada crash
Insufficient brake force was applied before an oil train slammed into a town in Quebec on July 6 and killed 50 people, officials have said.
Donald Ross, chief investigator for the Transportation Safety Board of Canada, said 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 was carrying 72 cars of crude oil when it slammed into the heart of Lac-Megantic, setting off massive explosions.
A spokesman for the agency said it has had a closer look at 25 tanker cars since gaining access to the blast site two days ago - and has taken pictures and samples.