Engineering work is taking place between Reading and Basingstoke.
Trains will not call at Basingstoke, Winchester and Southampton Airport Parkway. Journey times may be extended by up to an hour.
Engineering work is taking place in the Brighton area, closing various lines.
Buses will replace trains between Brighton and Lewes.
Engineering work is taking place between Ore and Ashford, closing all lines overnight from Monday evening until Friday morning.
A tree is blocking the railway in the Harrow & Wealdstone area. Trains running between London Euston and Watford Junction may be cancelled.
Disruption is expected until 15:00.
Engineering work is taking place between Castleford and Pontefract, closing some lines.
Trains between Leeds and Knottingley via Castleford will be replaced by a bus throughout.
Engineering work is taking place between New Mills Central and Stockport, closing some lines.
Engineering work is taking place between Lewisham and Hayes, closing all lines.
Trains between London Charing Cross and Hayes will not run.
Engineering work is taking place between Hartlepool and Seaton Carew, closing all lines.
Northern:
Buses will replace trains between Newcastle and Middlesbrough.
Engineering work is taking place between Dartford and Gillingham / Rainham, closing some lines.
Buses replace trains between Swansea and Carmarthen / Llandrindod on Saturday 18 and Sunday 19 March
Engineering work is taking place between Swansea and Llanelli (Saturday