Another option is to go to Realtime Trains, click on 'Advanced' and type in Worksop in the 'Location' box, and in the 'What Time' box select in the drop down box 0600-2000 and then press 'search'
This will give you a run down of all the 'paths' during normal daylight hours both passenger and freight. Please note these are all book paths, and does not necessarily mean they are all running that day.
To find out which are running go to the 'ID' column and click on the 4 digit head code. With a bit of practice you will be able to see if a train is running or not.
FRGT mean freight. Once clicked the 'Realtime' column will show in 'Dly' at the originating location if it is running late or early, this will progress down the list as the train is logged past each location. If nothing there chances are it is not running.
If all that sound like hard work.

Hope that Mark from Freightmaster.net comes on (which he does regularly) and he often very generously provides all the freight info for any particular site.
--- old post above --- --- new post below ---
I have just seen that the Nottingham to Worksop line is featured in the latest issue of Rail Express, that may also be of interest to you and your son.