Engineering work is taking place between East Croydon and Purley on Sunday morning, and all day between Purley and Earlswood.
Trains will be diverted to run on alternative routes, not calling at Coulsdon South, Merstham or Redhill.
Replacement buses will run between Purley and Horley, calling at all stations via Redhill.
Gatwick Express services will run to a reduced frequency, with trains running every 30 minutes.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner
You can find the location of your bus replacement by checking station signs or by searching for your station on our station information pages
Replacement Bus Travel Advice:
Bicycles are not allowed on rail replacement bus services at any time, unless fully folded. More travel advice for your replacement bus journey is available by selecting the Train Operating Company you are travelling with here.