dˈʊɹɹɪŋ ðə pˈiːk ˈaʊɚz, ðə sˈɜːvɪs ɪz ɪŋkɹˈiːst tʊ ˌʌp tə twˈɛnti tˈuː tˌiːpˌiːˈeɪtʃ ɪn ˈiːtʃ dᵻɹˈɛkʃən, ɪŋklˈuːdɪŋ tɹˈeɪnz ðæt ɹˈʌn vˈaɪə tʃˈɛɹɪŋ kɹˈɔs.
During the peak hours, the service is increased to up to 22 tph in each direction, including trains that run via Charing Cross.