 The extension to Drybridge followed in 1907 - 1908 on the introduction of passenger railmotors.The continuation of the line was therefore a GWR construction, in adoption of the Mitcheldean Road and Forest of Dean Railway route.Steam Mills halt was on the up side beyond a level crossing, after which came a shallow embankment, a bridge across the tramroad, an unusual joint bridge taking the Trafalgar tramway and the railway under a road, a skew girder bridge across the tramway, and Nailbridge halt (up side).