FILE - This photo provided by Nancy Run Fire Company shows a train derailment along a riverbank in Saucon Township, Pa., March 2, 2024. The collision highlights the shortcomings of the automated braking system that was created to prevent such crashes. None of the circumstances the National Transportation Safety Board described Tuesday, March 26, in its preliminary report on the derailment would have triggered the automated positive train control system to stop the trains. .
“PTC today has not generally been designed to protect them in that situation,” railroad safety expert Chris Barkan said. The three railcars that derailed after that first collision blocked the adjacent track, and the third train smashed into them at about 22 mph . The braking system relies on information from the railroad's signals to stop a train, and it can't detect when something is blocking the tracks. But given that the third train arrived less than a minute later, there wouldn't have been enough time to stop it anyway.
NTSB spokesman Keith Holloway said preliminary information “suggests that PTC limitations were involved in the accident” and no mechanical problems have been found at this early stage.
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