Engineering work is taking place between Haywards Heath and Brighton, closing some lines.
Until approximately 05:00 on Tuesday to Thursday mornings, buses will replace trains between Three Bridges and Brighton.
Check before you travel:
If you are travelling with Thameslink, you can plan your journey using the National Rail Enquiries Journey Planner.
If you are travelling with Southern, these changes are not currently shown in the National Rail Enquiries Journey Planner, please check back nearer to the time of travel.
Replacement bus travel advice:
For helpful advice if you need to travel on a rail replacement service, including accessibility and bicycle information, please use our Rail Replacement Services page.
You can find the pick-up and drop-off location of rail replacement services by checking station signage or by searching for your station on our Find a Station page.
Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.