Engineering work is taking place between Chesterfield and Sheffield until 07:40, closing some lines.
As a result the 08:23 Sheffield to London St Pancras International service will start from Derby at 08:25 and run to an amended timetable throughout.
A rail replacement bus will run earlier from Sheffield to Derby to connect with the train.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner