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Accident Report Detail

Undesired Train Acceleration and Deceleration

Executive Summary

On March 19, 2016, about 1:54 a.m. mountain daylight time, train 425 of the Denver, Colorado, International Airport’s (DEN) Automated Guided Transport System (AGTS) was routed from East Concourse C to the West Main Terminal through a turnout when it accelerated and then decelerated. No operator was on board the automated train. Four passengers were injured.

Probable Cause

The National Transportation Safety Board determines that the probable cause of the accident was a coding error in the software that allowed an incorrect speed code to be sent to the train while it traversed the crossover, resulting in rapid acceleration.

Accident Location: Denver , CO    
Accident Date: 3/19/2016
Accident ID: DCA16FR006

Date Adopted: 9/30/2016
NTSB Number: RAB-16-03
NTIS Number:  

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