1. Previously the large traincrew depot at Bedford covered a lot of Sutton loop work.
The idea of the future - that traincrew depots are opened at the ends of service groups and drive only those routes, mean that new traincrew depots at Luton and St Albans opened in May.
Bedford reduced in size and Luton and St Albans were filled with either volunteers or the less senior drivers forced to move. St Albans, being the furthest away from Bedford, has fewer volunteers than Luton, and more 'less senior'. Because of previous delays in training and a backlog of trainees, St Albans it seems, has a roster populated by a fair number of trainees (who aren't yet qualified or productive).
Since it opened in May, St Albans is the exclusive depot for Sutton loop duties.
The duties can be cross-covered by other depots by spare or rest day work drivers, but it evidently isn't enough at present.
Half of Luton depot should be doing Rainham duties but many aren't trained on the route yet.
Some Bedford drivers haven't been trained on new London Bridge layout, which leads us to....
2. Route knowledge is a problem in that not many Brighton drivers know the new layout at London Bridge High Level platforms and their approaches. The same goes for Horsham drivers, but you can add the Core as well that most don't sign, although some (together with some Brighton drivers) were sent to quickly learn St Pancras to Finsbury Park (and Kings Cross). They all need route conducting for the bits they don't know with associated knock on delays if trains get cancelled or delayed. This has been evident at Finsbury Park.
3. The duties won't be the same each day for an individual driver. For a start the duties are different lengths (between 6 hours and 9 hours 54 minutes), so are placed in a rota called a 'link' and are worked in rotation by drivers, with different rest days each week. This makes an 'average week' of 35 hours, with some being less and some being more.
Similarly to the Sutton loop mentioned above - on the GN, some Cambridge to Kings Cross stopping services are now run by Welwyn Garden City traincrew depot, which isn't actually in existence yet, but are separate rotas (links) at Kings Cross and Hitchin until the new depot buildings are constructed. There's the same problem here in that any vacancies or trainees will be placed in these links as the drivers with the most seniority will remain at Kings Cross or Hitchin. Also, whereas all of Cambridge and Peterborough are trained on 700s, there are many at Kings Cross both in the 'remaining at Kings Cross link' and in 'Welwyn link', and also the Welwyn link at Hitchin who require traction training on them.
One thing no one has mentioned yet, is that any train booked to go via the Core is now dealt with by Thameslink SDC (Service Delivery Centre) at Three Bridges, with the trains booked to go to Kings Cross (that's
booked not diverted) and Moorgate still being dealt with by Great Northern SDC at Kings Cross, and the extra phone calls, liaising, and added complications of left hand and right hand having to know what each are doing.
It remains to be seen whether phase two of transferring all the remaining GN services to come under Thameslink SDC, with the closure of Kings Cross SDC in the coming weeks, will make things better or worse.
It's huge. The list of things to overcome is of biblical proportions, and quite honestly if I could see it coming with nearly three weeks to go (see
here, the last line in particular) I don't know why Chris Grayling and Charles Horton couldn't.