Moss Valley branch was a two mile long single track line built by the Great Western Railway in what is now the county borough of Wrexham, Wales.
This included a rope-worked incline up Gwersyllt Hill, and the 220 ft Summerhill Tunnel to reach the Moss valley at Westminster Colliery.
The Moss Valley Branch was created by the Great Western Railway – under powers obtained in an act of Parliament[which?]
in 1873 – to obviate the cumbersome eastern section of its earlier line from Wheatsheaf Junction; the new route linked with the old near Westminster Colliery, and opened – for goods only – in mid 1882.
The section south of Gatewen had a somewhat chequered career, finally succumbing to a derailment on 18 August 1983, from which it never reopened.