Engineering work is taking place between London St Pancras International and Luton, closing some lines early on Saturday morning.
As a result, the 05:30 London St Pancras International to Sheffield service will start from Luton at 05:53.
If you are travelling from London, you should later train services.
Check before you travel:
These changes are not currently shown in the National Rail Enquiries Journey Planner, please check back nearer to the time of travel.