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Locomotive Type Steam Boiler, Blaen Rhondda is a substantial industrial relic from the post-medieval colliery workings that developed across the South Wales coalfield. Located in Rhondda, the boiler sits upon bedrock of the South Wales Upper Coal Measures Formation, Westphalian in age, comprising mudstone, siltstone and sandstone interlayered with economically significant coal seams and ironstone deposits. These geological conditions made the Rhondda valley a centre of intensive coal extraction from the nineteenth century onwards.
The steam boiler represents the mechanical infrastructure essential to colliery operation, generating the high-pressure steam needed to power winding engines, pumps and other pit machinery. Such boilers were typically mounted on substantial brick or stone foundations within engine houses near the mine shaft. The equipment would have driven the complex systems required to extract coal from considerable depths and manage water ingress in the increasingly deeper workings characteristic of mature coalfields.
The boiler survives as Cadw-protected monument GM509, a tangible remnant of industrial Wales during the era when coal dominated the region's economy, landscape and society. Its preservation reflects the historical significance of the Rhondda's mining heritage and the technological evolution of Victorian and Edwardian industrial practice.
Locomotive Type Steam Boiler, Blaen Rhondda is a scheduled monument protected by Cadw under reference GM509. View the official record →
Locomotive Type Steam Boiler, Blaen Rhondda is a substantial industrial relic from the post-medieval colliery workings that developed across the South Wales coalfield. It is designated a Scheduled Ancient Monument by Cadw under reference GM509.
Locomotive Type Steam Boiler, Blaen Rhondda dates from the post medieval/modern period, and is classified as a colliery. It is one of over 32,000 scheduled monuments protected across the UK.
Locomotive Type Steam Boiler, Blaen Rhondda 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 GM509.
Several scheduled monuments lie within 10 km, including Earthwork 360m NNE of Crug yr Avan (5.7 km), Crug yr Afan Round Cairn (6.1 km), Bwlch yr Avan Dyke (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Locomotive Type Steam Boiler, Blaen Rhondda'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.
Locomotive Type Steam Boiler, Blaen Rhondda 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.