The first links to a railway to Milford Haven came through the completion of the South Wales Railway in 1856. Isambard Kingdom Brunel had a vision of connecting London to New York City via a railway through Wales and then to a commuter port. The initial plan was to terminate the line at Fishguard and to create a ferry service to Ireland. The failure to complete Irish rail links meant that the terminus was modified to a location on the Milford Haven waterway. 1854 saw track reach Haverfordwest, at which point a decision had to be made as to the terminus. New Milford at Neyland was selected, in spite of opposition from Greville, and was completed in April 1856. As a result, Greville determined to finance a project himself which would see the railway come to Milford Haven under the Milford Junction Railway, a four-mile spur from Johnston. Construction began in August 1856 and lasted five years, finally completed in 1863, when the line was connected to the South Wales Railway at Johnston, and a station at Milford was opened. The line was, and remains, single track, but sufficient room was allowed in cuttings and under bridges for doubling the track if required. The opportunity to provide a rival to the South Wales Railway by using Milford as a terminus to the Manchester and Milford Railway was also explored at this time.