Passengers are being advised of major disruption this morning due to a power issue.
Some lines are blocked due to the issue between London Paddington and Heathrow Airport / Reading.
Trains may be cancelled, revised or delayed by up to 60 minutes.
Major disruption is expected until 14:00.
The electricity supply may need to be turned off whilst the fault is fixed, meaning no power to allow trains to run and stations may need to use emergency back up supplies to that passengers can board and alight trains safely.
Elizabeth Line passengers can use their tickets on London Underground, buses, the Docklands Light Railway, Southeastern, Thameslink and South Western Railway.
Heathrow Express say that passengers can expect a half-hourly service between London Paddington and Heathrow Terminal 5.
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