© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Ynysmaerdy Railway Incline is a post-medieval railway structure located in Wales, built to exploit the rich mineral resources of the South Wales coalfield. The monument sits upon geology of the Upper Coal Measures Formation, a Westphalian-age sequence of mudstone, siltstone and sandstone interbedded with coal seams and ironstone deposits that made the region economically vital during the Industrial Revolution. The ferricrete found in these strata provided additional mineral wealth that drew mining and quarrying enterprises to the area.
The incline represents the technological infrastructure that enabled the extraction and transport of coal and iron from deep workings to processing centres and markets. Such railway inclines were characteristic features of the South Wales industrial landscape, engineered to overcome steep terrain and transport heavy mineral loads efficiently. The design and construction methods reflected contemporary engineering practice for mineral railways operating in challenging upland terrain.
The monument is protected by Cadw under reference GM489, recognising its historical significance as evidence of Wales' industrial heritage and the sophisticated transport systems developed to support mining operations. The incline survives as a physical testament to the engineering solutions employed in extracting the mineral wealth that lay beneath the landscape, and to the economic importance of the coalfield during the modern period.
Ynysmaerdy Railway Incline is a scheduled monument protected by Cadw under reference GM489. View the official record →
Ynysmaerdy Railway Incline is a post-medieval railway structure located in Wales, built to exploit the rich mineral resources of the South Wales coalfield. It is designated a Scheduled Ancient Monument by Cadw under reference GM489.
Ynysmaerdy Railway Incline dates from the post medieval/modern period, and is classified as a railway. It is one of over 32,000 scheduled monuments protected across the UK.
Ynysmaerdy Railway Incline is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is GM489.
Several scheduled monuments lie within 10 km, including Cwm-Clais Castle Mound (3.6 km), Pen-y-Castell (5.3 km), Ergyd Isaf Round Barrows (7.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Ynysmaerdy Railway Incline's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Ynysmaerdy Railway Incline stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.