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WASHINGTON (AP) - The National Transportation Safety Board says a broken rail caused a coal train derailment in 2012 that killed two teens who were sitting on a railroad bridge in Ellicott City.

The NTSB on Thursday released a 19-page report on the results of its investigation. The derailment of the CSX train on Aug. 20, 2012 killed Rose Mayr and Elizabeth Nass, both 19. They were buried in coal when the train derailed.

The NTSB's report says an investigation revealed that a section of rail that caused the derailment showed evidence of a gradual breakdown. Since the accident, CSX has installed a fence to keep people off the bridge.

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