In 2004 a proposal was made by Transport for London for a London Regional Rail Authority to take control over some rail services that extended out of Greater London, including the branch line. In October 2009 Secretary of State for Transport Lord Adonis announced a plan to increase frequency on the line by allowing Hertfordshire County Council to lease the line from Network Rail and converting it to light rail from 2011. It was hoped that this would be possible for the same amount of subsidy the line received, as the new infrastructure required, such as a passing loop would be cheaper for light rail than heavy rail. Longer-term proposals envisaged extensions into Watford town centre via Clarendon Road and High Street, and St Albans city centre, possibly as far as St Albans City railway station, and possible re-instatement of the line to Hatfield. The light rail plan was cancelled in May 2013, as it was found to be impossible to deliver the scheme within the existing heavy rail subsidy as planned and more complicated than had been expected with disputes over apportionment of ticket revenue and who was responsible for the cost of maintaining structures. Hertfordshire County Council pledged to prepare a more ambitious bid to the DfT for funding for full segregation from the national rail network and extensions on either end rather than to lease the line from Network Rail. In a Draft Rail Strategy consultation published in June 2015, Hertfordshire County Council highlighted the difficulties presented by single-track operation on the Abbey line, in particular the fact that the maximum service frequency that can be operated is one train per 45 minutes. The report notes that the service pattern makes it difficult to enable interchange connections with other rail services and to offer a "clockface" timetable that is memorable to passengers. Among the solutions evaluated by Hertfordshire are: a proposal to reopen the passing loop at Bricket Wood; running trains which skip certain stations; closing some stations; conversion of the line to light rail operation; and conversion of the line to a guided busway. The passing loop solution would enable a 30-minute service, but the report notes that there would be an additional cost of running the line with two train sets (rather than a single train, as at present), and that it would be "difficult to achieve a favourable business case". The report states that