All lines have now reopened and trains can run on their normal routes after disruption on First Great Western due to a signalling problem between Didcot Parkway and Swindon.
There are still delays of around 30 minutes to services and buses remain in operation. First Great Western expect normal service to resume from around 1pm.
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Freezing conditions have caused 24 hours of cross-channel travel chaos - which is set to continue into tonight.
The icy conditions has put a strain on many services in the South, especially those that help the elderly.
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