The Rail Accident Investigation Branch (RAIB) has launched a preliminary examination into an accident in which a track worker was struck by a road-rail vehicle (RRV).
The incident happened on the Midland Main Line at Braybrooke, Northamptonshire.
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The operative was walking along the track and directing the movement of another RRV on an adjacent line when they were struck.
The track worker sustained a leg injury that required hospital treatment.
The railway watchdog says it has published a safety digest with the information gathered to date.