Horrifying Runaway Train: San Bernardino train disaster SP 7551 East | Mayday | Wonder

On 12 May 1989, a 69-car freight train goes out of control while descending from California's Cajon Pass. It derails in a residential neighbourhood of San Bernardino after reaching speeds in excess of 100 miles per hour (160 km/h). Two residents and two train crew members are killed in the initial crash. More than a week later, an underground gasoline pipeline, damaged by earth-moving equipment during the post-crash clean-up, ruptures and sparks a fire that kills another two people.

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Mayday: Experts analyze various plane crashes with an aim to figure out how these disasters occurred. They also shed light on how such accidents shaped the aviation industry and improved safety standards.

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