The first section of the Merthyr, Tredegar and Abergavenny Railway from Abergavenny to was opened on 29 September 1862. The line was leased and operated by the London and North Western Railway which acquired the smaller railway company on 30 June 1866. The L&NWR was itself amalgamated into the London, Midland and Scottish Railway in the 1923 Grouping. Clydach first appeared in Bradshaw in January 1864, however the line's engineer, John Gardner, reported on 27 August 1863 that the station had already opened, with minutes of L&NWR meetings referring to a projected completion date of mid-September 1863. The station was situated below a quarry-scarred mountainside at the top of which were houses bordered by rock and scree situated ominously near the edge. The station was east of Clydach Viaduct composed of eight semi-circular arches built of old red sandstone with spans on a curve of radius at a gradient of 1 in 38. The viaduct, which is long and high with between the parapets, was designed by Gardner to carry the line over the Clydach Gorge and the Clydach Stream. The distance between the parapets was increased to when the line was doubled in 1877. To the west of the station was the twin-bore Clydach Tunnel. The station had two platforms; on the Up platform was a station building of generous proportions constructed of locally sourced limestone. A private siding served the Clydach and Abergavenny Lime and Stone Company which operated a nearby limestone quarry and lime kilns supplying the Clydach Ironworks. The company used its own private owner wagons. The siding trailed off upwards to the north-east at the western end of the viaduct where a weighing machine and office were installed in the fork of the junction. Opposite the weighing machine was a signal box built in 1898. The works closed in after which goods facilities were withdrawn from Clydach on 2 May 1938. Decline in local industry and the costs of working the line between Abergavenny and Merthyr led to the cessation of passenger services on 4 January 1958. The last public serviceover the line was an SLS railtour on 5 January 1958 hauled by GWR 6959 No. 7912 Little Linford Hall and LNWR Coal Tank No. 58926. Official closure came on 6 January.
Present
Parts of the platforms and the station house have survived and are divided between two private owners. The trackbed near the station is part of National Cycle Route 46.
