Paddington station will be closed over Christmas this year to allow for electrification and Crossrail works. The six-day closure starts on Christmas Eve, Saturday December 24th through to Thursday 29 December. This will mean trains are very busy on Friday 23 December, and GWR is recommending customers to book ahead and travel early if they can.
Trains will start and finish at Ealing Broadway throughout the closure with customers completing their journey by London Underground. There are no lifts at the station. GWR is therefore recommending that customers use trains to and from London Marylebone changing at Oxford. It has arranged for tickets to be valid on these services.
You can find full details on their website including details on travelling with bikes, their sleeper service and their Pullman dining service.