A 74-car freight train carrying crude oil was parked unattended on a descending grade with insufficient handbrakes applied. After the locomotive was shut down following a small fire, air brake pressure bled off and the train rolled seven miles into Lac-Mégantic, derailing in the town centre.
Multiple tank cars ruptured and ignited, destroying more than 30 buildings and killing 47 people. The investigation identified 18 contributing factors, including weak safety culture, inadequate regulatory oversight and the use of tank cars unsuited to crude oil.
The disaster reshaped North American rail regulation for dangerous goods, including train securement rules and tank car standards.
Why this event still matters
Historical incidents shape the rules that protect people today — building codes, evacuation policy, warning systems and inspection regimes almost always trace back to a specific disaster. Studying Lac-Mégantic Rail Disaster alongside current events is how preparedness improves.
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