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After blasting the federal government and Canadian Pacific in a train derailment and partial bridge collapse in Calgary last year, Mayor Naheed Nenshi is welcoming a report released Wednesday that blamed unprecedented flood water for the incident.

An investigation and report by the Transportation Safety Board of Canada indicated the Bonnybrook bridge over the swollen Bow River gave way beneath a Canadian Pacific Railway train on June 27 as the city was trying to recover from high water that had washed over many neighbourhoods just days before.

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Six tank cars, of which four were carrying highly explosive, toxic liquids, teetered on the failing bridge. They were unloaded and removed over two days and never went into the river.

“Unprecedented flooding of the Bow River was a major factor in this bridge failure. The bridge handled several major floods for over a century, but the river was not to be denied last June,” said George Fowler, a civil engineer who conducted the investigation.