On May 12, 1989, at 7:36 a.m., a freight train from the Southern Pacific, transporting trona, lost control while descending Cajon Pass, derailed catastrophically on an elevated curve, and plowed into a residential area on Duffy Street, a quiet residential street in San Bernardino, California.

The accident was devastating; the lead locomotives and all freight cars were destroyed. 

The conductor, head-end brakeman, and two residents lost their lives in the incident. In addition, seven houses on the street immediately next to the tracks were demolished by the wreck, as were the lead locomotives and all of the freight cars. 

Clerks in Mojave had miscalculated the weight of the train, while the engineer and crew were unaware that one of the rear helper engines had inoperative dynamic brakes. Hence, there was not enough dynamic braking force available to maintain control of the train's speed during the descent. 

This is the story of the San Bernardino train derailment in 1989. 

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