Forty years ago this weekend, a train derailment, explosion and fire in Mississauga forced nearly a quarter of a million people from their homes. A new exhibit calls the Mississauga Miracle honours what became the largest peacetime evacuation in Canada's history. Fire crews battle the train derailment on Mavis Road in Mississauga on Nov. 11, 1979. (CBC) Marie Lucinger-Busic says she doesn't mind sharing her wedding anniversary with the Mississauga train derailment. On Nov.