Engineering work is taking place between Purley and Balcombe all day, closing some lines.
Services between London and Brighton will be subject to extended journey times of around 10 minutes.
Engineering work is taking place between Harlesden and Hemel Hempstead, closing all lines from 20:10 on Saturday and on Sunday.
Engineering work is taking place between Three Bridges and Brighton, closing all lines.
Southern:
It is not yet known how Southern will be affected by this engineering work.
Engineering work is taking place between Hertford North / Welwyn Garden City and Stevenage, closing all lines before 08:00.
Engineering work is taking place between Stonehouse and Gloucester, closing some lines.
Engineering work is taking place between Robertsbridge and Hastings, closing all lines.
Trains will only run between London Charing Cross and Robertsbridge.
Storm Francis is expected to bring high winds and heavy rain to parts of the UK today. Network Rail have imposed speed restrictions on services across the CrossCountry network.
Check your train journey before you leave home today as it may be affected by the weather.
A failure of the electricity supply between Conway Park and Birkenhead North is resulting in disruption to trains running between these stations.
Trains may be cancelled, delayed or revised. Disruption is expected until 10:30.
Heavy rain flooding the railway at Bridgeton is causing disruption to journeys between Glasgow Central and Rutherglen.
Trains may be cancelled, delayed or revised. Services from Dalmuir to Larkhall and services from Larkhall to Milngavie have been suspended.
Engineering work is taking place between Harpenden and Luton, closing various lines over the course of the weekend.