Engineering work is taking place between New Barnet and Welwyn North, closing some lines overnight from Monday evening until Friday morning.
From 23:10 until the end of service each night, trains between New Barnet and Welwyn North will be subject to extended journey times.
Additionally the 00:36 London Kings Cross to Royston service will not run - you should use alternative train services instead.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner