 However, in September 1922 the GWR opened the Cwmgorse branch southward from Gwaun-cae-Gurwen to Duke Colliery; this was a short stub of the through line.In 1960 the branch was further extended to Abernant Colliery by British Railways, and the branch continued in use until 1980.At the beginning of 1923 the main line railways of Great Britain were "grouped" under the terms of the Railways Act 1921.