Engineering work is taking place between Potters Bar and Welwyn Garden City, closing some lines on Sunday evening / Monday morning.
As a result, trains from London will be unable to call at Welham Green, and trains towards London will be unable to call at Welham Green or Hatfield.
Rail replacement buses will run between Welwyn Garden City and Potters Bar.
Check before you travel:
You can plan your journey using the National Rail Enquiries 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 set-down 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.