replaced the horses in 1877 when trials were undertaken with one of Henry Hughes's patent tramway locomotives, aptly named Pioneer. These were adjudged to be a success, and two further locomotives of the same type were obtained, although a dispute between the Swansea Improvements & Tramways Company (which owned the locomotives) and the line's then owner, John Dickson (who had come into possession following the death of George Byng Morris) meant that horses continued to operate certain services until 1896. At this time there was a junction between the Mumbles Railway and the Swansea town tramway system at the Slip, allowing S.I. & T. cars to run through from Swansea town centre to Oystermouth. The nature of the dispute was such that the Swansea & Mumbles company demanded that the S.I. & T. horse cars should follow their own steam-hauled services on the line. In 1889, a new company, the Mumbles Railway & Pier Company, was incorporated to extend the railway beyond Oystermouth to a new pier close to Mumbles Head. The first section, to Southend, was opened in 1893 and the remainder, including the pier, in 1898. The Clyne valley branch continued to be used for coal traffic from Rhydydefaid pit until its closure in 1885 after which the entire branch fell into disuse. In 1896 the promoters of the Gower Light Railway proposed incorporating it into their scheme but nothing came of it. The original branch to Ynys Gate (as authorised in 1804) was relaid in connection with the Clyne Valley slant (opened 1903) and used for coal traffic until the colliery closed in 1915. The extension of 1841/2 remained abandoned until 1920 when a narrow-gauge tramway was laid on its formation to carry coal from Ynys slant to Ynys Gate. This was used only until 1921 when the slant closed. There was then no further traffic on the branch, although the track remained in situ and was still usable as late as 1936 when it is recorded that a diesel locomotive made a trip up the branch as far as Ynys Gate. A somewhat motley collection of steam locomotives was used to maintain services between 1877 and 1929, beginning with the Hughes tramway locomotives mentioned above (which were actually owned by the S.I. & T. and therefore not able to be used on the railway after 1878). Dickson had purchased two saddle tank locomotives of more conventional