Engineering work is taking place between Harrow & Wealdstone and Watford Junction closing the line.
A reduced service will run between London Euston and Queen Park.
Passengers should use London Underground Bakerloo line between Queens Park and Harrow & Wealdstone.
Replacement buses will run between Harrow & Wealdstone and Watford Junction.
Planning your Journey
For full details of these changes and the impact on your journey, please use the National Rail Enquiries Journey Planner