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The Sunday evening express train from Hastings to London was traveling 70 miles per hour (113 km/h) when it struck a stressed and fractured rail not far from London’s Hither Green depot. The packed train derailed and partially overturned, killing 49 people in one of the worst rail disasters in British history. Several other trains may have successfully passed over the broken rail earlier. What safety feature, present on the particular train that derailed, may have triggered the accident? Discuss
Source: The Free Dictionary