TfL have said between Good Friday and Saturday, a reduced service will operate between Paddington and Maidenhead / Heathrow. All trains will start and terminate at Paddington National Rail station. Heathrow Terminal 4, West Drayton, Langley, Slough, Burnham and Maidenhead will be served by two trains an hour. West Ealing will be served by four trains an hour. Ealing Broadway, Southall and Hayes & Harlington will be served by six trains per hour.
From Good Friday until Easter Monday, no service will operate between Abbey Wood / Stratford and Paddington. Trains will operate between Shenfield and Liverpool Street National Rail station (not serving Whitechapel) and between Paddington National Rail station and Heathrow / Reading.
https://www.standard.co.uk/news/london/travel-live-updates-m25-motorways-easter-traffic-tfl-tube-overground-elizabeth-line-trains-euston-b1148457.html
