It was suggested that most or all of the line from Queen's Park to Watford Junction would be used exclusively by the London Underground, and London Overground services would be withdrawn.
Dikemukakan bahwa sebagian besar atau semua jalur dari Queen's Park ke Watford Junction akan digunakan secara eksklusif oleh London Underground, dan dengan demikian layanan London Overground akan dihentikan di jalur-jalur tersebut.