http://www.firstgreatwestern.co.uk/LiveUpdateList.aspxThis from
FGW▸ website this morning. Worth checking the above link as services are being affected with cancellations to services taking place:
Train services between London Paddington and Reading are being disrupted due to emergency engineering works in the London Paddington area.Engineers are working as fast as possible to restore services to normal. Short notice alterations, cancellations and delays of up to 60 minutes can be expected.
The Greenford branch line is currently suspended. Replacement road transport is in operation between Ealing Broadway and Greenford in both directions. An hourly Heathrow Connect service will operate in both directions between London Paddington and Heathrow. London Underground, Chiltern Railways and Southwest Trains will be accepting First Great Western tickets on affected routes.