Construction was undertaken by the
Great Western Railway, which was a majority shareholder in the G&DFR. It was agreed that the South Wales Railway would be responsible for the whole of the southward extension from Grange Court, which then became the northern limit of the SWR. Building of the G&DFR was generally straightforward, with only an opening bridge over the Severn at Gloucester and the junction arrangements with the GWR at Gloucester station presenting material challenges. The line opened together with the western portion of the SWR on 19 September 1851, with services initially running from Gloucester to a temporary station,
Chepstow East on the eastern side of the
River Wye at Chepstow. Full services through to Swansea began on 19 July the following year. On the G&DFR part of the route a station was opened at
Oakle Street, about 5 miles from Gloucester. This would close on 31 March 1856, but reopened on 2 July 1870 and remained in use until 1964. == Later history ==