Many trains became stranded between Paddington and Reading due to the loss of power supply.
TRAVELLERS to London Paddington from South Wales are being advised of a reduced timetable because of damaged overhead wires on railway lines near the capital.
"Owing to the extent of the damage, no trains are expected to be able to operate between London Paddington and Hayes & Harlington in either direction for much of Wednesday".
Commuters faced travel chaos across southern England today after a high-speed train tore down overhead wires outside one of Britain's busiest stations.
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The damage was caused by a high-speed Class 802 Hitachi train which was being tested between London and Bristol ahead of its handover to GWR.
500m of overhead cables were damaged during a test run of a brand-new Hitachi train on Tuesday night.
People can travel to and from the airport via a rail replacement bus service, to take a taxi or use the slower connection on the London Underground subway network.
A spokeswoman said: "We are experiencing severe disruption on all services into and out of London Paddington and this is likely to affect services in other areas for the rest of the day".
The incident happened exactly one year after the first of the Class 800 trains to enter GWR service suffered leaking air conditioning and a 41-minute delay on its inaugural journey with senior politicians and rail bosses on board. However, there'll be "a small number" of cancellations or alterations during the evening peak period.