Engineering work is taking place between Welwyn Garden City and Hitchin, closing some lines.
At the end of Saturday service buses will replace trains between Welwyn Garden City / Hertford North and Letchworth Garden City.
The 23:11 Horsham to Hitchin service will not run. A rail replacement bus service will run between London Kings Cross and Peterborough.
From the start of Sunday service until approximately 08:20, buses will replace trains between:
Check before you travel:
You can plan your journey using the National Rail Journey Planner.
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.