the South London Line, and a reinstated disused alignment. In addition Crossrail would interact with the RUS area at Abbey Wood from 2017 (at the earliest). Another project that does not directly form part of the RUS area but has a knock-on effect certainly to passenger services and possibly to freight services is High Speed One (HS1). Largely because of these interdependencies the timescale of the SLRUS, while divided into a short, medium and long term, does not coincide with NR's Control Periods (CP) as is usual with RUSs. The short term is up to 2010 to coincide with the introduction of the December 2009 timetable. There are really three medium term timescales up to 2012 when much train lengthening is recommended to have been implemented, and Thameslink Key Output 1 is scheduled to be completed up to 2015 when Thameslink Key Output 2 is scheduled to be completed immediately beyond 2015 when the full Thameslink 24tph becomes operational A longer term timescale corresponding approximately with the remainder of CP4 and CP5 (commencing April 2019) and beyond is examined. Apart from the prerequisites to train lengthening, mainly platform lengthening, increased depot capacity and power upgrades, the medium term interventions involve little infrastructure apart from the heavy undertakings within the contingent projects described above. Short term Three major projects affect the situation in the short term: the reconstruction of Blackfriars Thameslink station the starting of domestic passenger services on High Speed 1, scheduled for December 2009 the re-opening of the extended ELL, scheduled for June 2010 The reconstruction of Blackfriars The commencement of works (in March 2009) results in the closure of the south-facing terminating platforms, 1 to 3, on the east side of the station. Consequently, all services need to continue north through Blackfriars. A recasting of services is necessary and, as this location is the boundary between the overhead-line and third-rail electrification area, additional dual-voltage stock is required. High Speed One Originally, with the prospect of re-routing services from east Kent to London to use High Speed One, some service frequencies elsewhere on the Southeastern franchise were to be reduced. The RUS recommends retaining approximate the previous service levels on the classic lines. The southern extension of ELL The East London Line Phase 1 extension (ELLx1) south of New Cross Gate will use the slow lines to serve all stations through Norwood Junction, where there is a branch to