səbˈɜːbən ɹˈeɪl sˈɜːvɪsᵻz ɪn lˈʌndən, æz ɪnðə ɹˈɛst ʌv ɡɹˈeɪt bɹˈɪtən, ɑːɹ ɹˈʌn ˌɔn ɐ sˈɪstəm ʌv ɹˈeɪl fɹˈæntʃaɪzᵻz ænd ˈɑːpɚɹˌeɪɾᵻd baɪ ɐ nˈʌmbɚɹ ʌv pɹˈaɪvət tɹˈeɪn ˈɑːpɚɹˌeɪɾɪŋ kˈʌmpəniz, mˈænɪdʒd baɪ nˈæʃənəl ɹˈeɪl.
Suburban rail services in London, as in the rest of Great Britain, are run on a system of rail franchises and operated by a number of private train operating companies, managed by National Rail.