West Somerset Railway says today's crash is the third to have happened at the bridge in Norton Fitzwarren since June last year.
This is the first where the car actually landed on the track. The driver was not hurt and the Ford Fiesta has been removed.
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Police divers have dragged the body of a man from the river Avon in Bristol city centre. A man was seen struggling in the water last night.
The new man in charge will watch his side from the Director's Box at Charlton this afternoon.
Police are resuming their search for a man who was last seen swimming in the river in the Welsh Back area. Divers have been deployed.