Engineering work is taking place overnight in the Stevenage area, closing some lines.
At the end of Saturday service (approximately 01:20 Sunday), buses replace trains between Potters Bar / Hertford North and Letchworth Garden City.
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 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.