Rail services into Cardiff are experiencing major disruption with journeys cancelled or delayed due to a fire near track.
The blaze at an electrical substation between Newport and Cardiff Central has damaged an overhead line and signalling equipment.
Emergency services and Network Rail staff are on site at St Brides Wentloog, working to manage the situation.
Rail replacement transport is running between Cardiff and Gloucester but major disruption is expected to continue throughout Sunday.

Due to a fire next to the track between Newport South Wales and Cardiff Central all lines are blocked. Disruption is expected until the end of the day.
Train services between London Paddington and Cardiff Central via Bristol Parkway may be cancelled, delayed or revised.
Customer Advice
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We are sorry for the delay to your journey.
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Network Rail advise that there is a lineside fire between Cardiff Central and Newport in the St Brides area. The emergency services are on site working to extinguish the fire as quickly and safely as they can. Once this has been done the railway and associated infrastructure will have to be inspected. We currently have no estimate for when we may be able to run trains again through the area.
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Rail replacement transport has been requested but is proving difficult to source in the area.
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To help you complete your journey, you may use your ticket, at no extra cost on Transport for Wales train services.
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Please check your journey at gwr.com/check
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We will update this message with more information when we have it.
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Transport for Wales are conveying passengers via any reasonable route until further notice. Arrangements have been made for Great Western Railway rail tickets to be accepted for these journeys.