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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This afternoon's rain will clear this evening, bringing a mild night and morning tomorrow.
Cloudier this afternoon, and mild temperatures tomorrow morning.
A retired solicitor from Bristol has died after being swept overboard while competing in the Clipper Round the World yacht race.