wˌɛn lˈʌndən ˌoʊvɚɡɹˈaʊnd wʌz lˈɑːntʃt, ɪt wʌz fˈʊli ˈɪntᵻɡɹˌeɪɾᵻd ˌɪntʊ tˌiːˈɛf ˈɛlz tˈɪkɪɾɪŋ nˈɛtwɜːk fɹʌm ɪts lˈɑːntʃ, ɪŋklˈuːdɪŋ fˈʊl ɐksˈɛptəns ʌvðɪ ˈɔɪstɚ kˈɑːɹd ᵻlɛktɹˈɑːnɪk smˈɑːɹtkɑːɹd sˈɪstəm.
When London Overground was launched, it was fully integrated into TfL's ticketing network from its launch, including full acceptance of the Oyster card electronic smartcard system.