A signalling fault has caused disruption on the Elizabeth line.
The issue, reported between Langley and Slough, has blocked some lines towards Reading and led to delays of up to 20 minutes.
Passengers have been advised to check their journeys before travelling.
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Services between London Paddington and Slough have been affected, with the disruption expected to last until 3.15pm.
Travel may be delayed or revised.
Affected passengers may be eligible for compensation.
To make a claim, travellers should keep hold of their tickets and take note of their journey details for reference and verification.
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