TfL invites EoIs for constructing Gospel Oak – Barking Line extension August 8, 2016 | Europe News Transport for London (TfL) has invited expressions of interest (EoIs) for constructing a 4.5-km extension of the London Overground Line, Gospel Oak – Barking, to the Barking Riverside developmen... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password