Engineering work is taking place between Harrow-on-the-Hill and Great Missenden, closing all lines.
No trains will run between Great Missenden and London Marylebone.
The emergency services are dealing with an incident near the railway between Birmingham New Street and Bromsgrove / Redditch. Trains may be cancelled or delayed by up to 20 minutes whilst they complete their work.
This is expected until 19:00.
Engineering work is taking place between Welwyn Garden City and Stevenage, resulting in the closure of some lines.
Great Northern
Engineering work is taking place overnight between Manchester Victoria and Smithy Bridge, closing some lines.
Engineering work is taking place between Hitchin and Sandy, closing some lines between 00:15 and 05:50 on Tuesday to Friday mornings.
As a result, trains from London will be unable to call at Arlesey.
A trespasser on the railway between Limehouse and Stratford means some lines are blocked.
A tree is blocking the railway between Langbank and Bishopton means the line towards Glasgow is blocked. As a result of this, trains between Gourock / Wemyss Bay and Paisley Gilmour Street may be cancelled, delayed or revised.
This is expected until 22:45.
Due to a member of train crew being unavailable between Bletchley and Bedford fewer trains are able to run.
Rail replacement buses will run between Bletchley and Bedford.
Disruption is expected until approximately 20:45.
Engineering work is taking place between Tulse Hill and Selhurst, closing all lines early on Sunday morning.
Engineering work is taking place between Horsham and Bognor Regis, closing various lines overnight from Monday evening until Friday morning.