Thanks to an anonymous commenter for pointing out that a whole load of info about the future of the North London Line has turned up on the Office of Rail Regulation website.
For one thing, they've chosen a service pattern, which I've illustrated above (the big numbers are frequency in tph, or trains per hour). The service on the North London Line are:
- 4 tph Stratford - Camden Road - Gospel Oak - Willesden Junction - Richmond (the current North London Line service)
- 2 tph Stratford - Camden Road - Gospel Oak - Willesden Junction - Clapham Junction
- 2 tph Stratford - Camden Road
The 2 tph West London Line shuttle will continue, giving a train every 15 minutes between Clapham Junction and Willesden Junction. The Gospel Oak to Barking line stays self contained, with a 4 tph service, apparently due to the high cost of through platforms at Gospel Oak. The connections at Gospel Oak in the draft timetable don't look good. No upgrade to the Euston-Watford service is included yet.
There'll also be 8 trains per hour beyond Dalston Junction to Highbury & Islington. The diagram in the application form names them as the Crystal Palace and New Cross services, meaning the third service - from West Croydon - will only go as far as Dalston Junction.
There's a detailed diagram of the new track layout between Camden Road and Dalston, which confirms the plans for the East London Line to have a segregated route to Highbury & Islington, with little possibility of ELL trains continuing beyond there (forget about circular services). Highbury & Islington will end up with 3 eastbound platforms, each on a separate island.
Another document gives details of how stations will be refurbished, with improved CCTV, lighting, help points and PA systems. Stairs, flooring, walls, canopies and platform services will brought up to higher standards. LED next train indicators will be installed.
Construction work to rebuild the North London Line track begins this September, with the new timetable due in December 2010.