One of the trains involved in the Salisbury crash on Sunday ran 220 metres past a stop signal before hitting another service, investigators have said.

The driver did attempt to break before reaching the signal, the Rail Accident Investigation Branch (RAIB) added.

But despite the intervention of the train’s automatic protection system, which should assist with emergency braking, the train did not stop until it reached a junction close to Fisherton Tunnel.

In a preliminary report, the RAIB said that was because the South Western Railway (SWR) train’s wheels slipped on the rails.

In the ensuing collision, both it and a Great Western Railway service derailed.

They “continued some distance” into the tunnel before coming to a stop, the RAIB said.

The RAIB will be looking at how Network Rail managed what it calls “low wheel/rail adhesion”.

Salisbury train crash: ‘Wheel slide’ most likely cause of collision, say investigators

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Salisbury train crash: Driver in hospital with ‘life-changing injuries’, police say

In addition, it will examine Network Rail and SWR’s general policies on the subject.

The driver of the SWR service suffered “life-changing injuries”, police said.

Thirteen passengers were treated in hospital for minor injuries.

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