Engineering work is taking place between Littleport and Kings Lynn, closing the line each night.
From 23:15 each night, buses will replace trains between Ely and Kings Lynn.
Engineering work is taking place between Bedford and Luton, closing all lines.
From 22:45 on Saturday until 09:15 on Sunday, buses will replace trains between Bedford and Luton.
Engineering work is taking place between Wickford and Southend Victoria, closing all lines until 09:15.
Before 09:15, buses will replace trains between Wickford and Southend Victoria.
Engineering work is taking place between Witham and Colchester, closing all lines overnight.
Engineering work is taking place between Wickford and Southend Victoria, closing all lines until 09:15.
Before 09:15, buses will replace trains between Wickford and Southend Victoria.
Engineering work is taking place between Stevenage and Peterborough / Letchworth Garden City, closing all lines until 08:00.
Engineering work is taking place between Cooksbridge and Lewes early on Tuesday and Wednesday, closing all lines.
As a result, the 01:08 Haywards Heath to Eastbourne service will be replaced by a bus.
Bridge and tunnel maintenance is taking place between Crianlarich and Fort William, closing the line.
Engineering work is taking place between Willesden Junction and Kentish Town West, closing all lines.
Buses will replace trains between Willesden Junction and Camden Road.
Engineering work is taking place between Aberystwyth and Machynlleth, closing some lines.
The 05:30 Aberystwyth to Birmingham International service will be replaced by a bus between Aberystwyth and Machynlleth.