Disneyland employees heard an unusual clacking noise coming from the wheels of Big Thunder Mountain train No. 2 on the morning of Sept. 5 and planned to pull it out of service when it returned to the station, a ride operator told investigators from the Anaheim Police Department. But the train never returned to the station. The locomotive that leads the train lost a "bogie"- the assembly that carries the rear wheels - derailed, decoupled from the rest of the train, and struck the roof of Safety Tunnel One, according to reports by Anaheim police and the county coroner's office.
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