Engineering work is taking place between Hemel Hempstead and Wembley Central, resulting in the closure of some lines.
From 20:00 on Saturday and all day on Sunday, trains between East Croydon / Clapham Junction and Watford Junction will now run between East Croydon / Clapham Junction and Shepherds Bush.
You can travel on Southern services to London Victoria and London Underground between London Victoria and London Northwestern Railway between London Euston and Watford Junction.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner