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Freight train derailed in Carlisle as a result of 'false flanges' on wheelset

Nov 16, 2023

An investigation into the derailment of a freight train has resulted in a potential cause confirmed for the accident.

The train, which was the 5:15pm Clitheroe to Carlisle Yard freight service, derailed at Petteril Bridge Junction, near Carlisle.

The freight train involved was formed of a Class 66 locomotive and 14 loaded cement wagons.

Five of these wagons derailed, and one of the derailed wagons subsequently entered the river Petteril.

No injuries were caused by the accident, which led to substantial damage to railway infrastructure and some of the vehicles involved.

The passenger lines from Newcastle to Carlisle were blocked as a result of the accident.

A spokesperson from the rail accident investigation branch, a government body, said: "Currently available evidence indicates that the derailment was almost certainly a result of a wheelset with false flanges encountering a set of switches that are part of the junction.

False flange on a wheelset involved in the derailment (Image: RAIB)

"False flanges are associated with the flat areas on wheel treads which can result when rail wheels stop rotating while a vehicle is running.

"Our investigation will seek to identify the sequence of events which led to the accident.

"It will include consideration of track conditions, the condition of the wagons, wagon characteristics, the status of the train's braking systems and any underlying management factors.

"Our investigation is independent of any investigation by the railway industry or by the industry's regulator, the office of rail and road."

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