It is for train companies, working with local stakeholders and TfL, to bring forward proposals to extend the Oyster or Contactless Payment systems. The Department will consider proposals which are not commercially detrimental to its portfolio of rail franchises or which are otherwise supported by a strong business case. As the TfL system has been expanded it has become harder to strike a balance between the Oyster fares levels and those of the train operator. However, I am also pleased to say that the GTR franchise has committed to making its KeyGo pay-as-you-go product available for journeys made wholly on its network by the end of January 2018.