The work will take place during the weekend and affect the train on Saturdays and Sundays (April 12 and 13).
We have outlined and simplified the details so that you can plan your trip.
Saturday (April 12):
The engineering work is carried out in the EarlSwood or Salfords area, closing all the lines.
As a result, no trains will call Earlswood or Salfords.
The engineering work is also being carried out in the areas of Southampton and Brockenhurst, closing several lines.
The trains will not call Winchester and Southampton Airport Parkway.
Travel times will extend up to 45 minutes.
More engineering works is being carried out between Wembley and Watford Junction, closing several lines.
From 8 pm on Saturday to the end of the service, trains will not be made between Shepherds Bush and Watford Junction.
Sunday (April 13):
The engineering work is carried out until 9.15 am between the Littlehampton area, closing all the lines.
Until 9.15 in Sunday morning, buses will replace trains between Littlehampton or Barnham and Chichester.
Travel times will increase when using replacement buses.
The engineering work is also being carried out between Redhill and Reigate, closing all the lines.
Replacement buses will work between Redhill and Reigate.
