 Chigwell and Grange Hill were built in cuttings, Hainault and Fairlop on embankment, and most of the route south of Barkingside including Newbury Park was in a cutting.Only the platforms at Roding Valley and Barkingside (eastbound only) are accessible from street level.Works for accessibility to each of the platforms at Roding Valley were completed in 2009; hitherto there were a couple of steps to street level.