Yes, Transport for London (TfL) has every confidence that the new electric trains supplied by Bombardier Transportation will be providing a full service on the Gospel Oak to Barking line before the end of 2019.
A third brand new four-car electric train entered passenger service on the line on Monday 24 June, which has allowed the regular 15-minute frequency to be restored. Once the new trains are operating reliably on the line, more trains will be introduced over the coming weeks until the service is operated entirely with new electric trains.
Transport for London (TfL) is very sorry for the inconvenience the delay to the new trains has been causing to customers. As a well-deserved thank you to passengers on this line for their patience I have secured a month of free travel from September. TfL will provide more detail on this closer to the time.