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A volunteer member of staff was seriously injured after being hit by a train wagon, the Rail Accident Investigation Branch (RAIB) said.
The Gartell Light Railway volunteer was injured near to the Common Lane level crossing in Yenston, Somerset at 09:35 BST on 17 April.
The railway was not open to the public when the incident occurred.
The RAIB said the train was moving at low speed when the person attempted to get off the wagon and was struck by it.