Whilst it is mostly Mon-Fri office hours classroom based work with an assessment at the end of each module, you do get to go out and do some hand on practical stuff too. Usually youll go out into the yard and practice personal track safety, travel to Mach depot for 158 training, Birkenhead for 230 training. If Network Rail can accommodate you should get to visit a mechanical signal box (often Gobowen or one of the Shrewsbury boxes) and Chester Power Box when studying signalling. For retail you do a day with a mentor doing tickets for a shift. When it comes to dispatch youll go out with your trainer doing doors, and eventually toward the end of classroom you do a week with a mentor one on one working trains following their shift pattern.
At the end of classroom you do the big exam, then go out route learning which takes a few months depending on the depot. At the end of route learning you do 3-4 weeks with a mentor (1 on 1) before being signed off over each route with your manager then finally let out alone.
Quite a few needed for Chester due to upcoming changes in the May timetable, presumably as the changes involve the coast, HHD/LLJ may need more too.
Hope this helps!