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Cof Cymru: National Historic Assets of Wales · Wales

Former Penllwyn Tramroad Viaduct at Nine Mile Point

Ynysddu, Caerphilly, Wales

A Grade II listed building in Nine Mile Point, Ynysddu, Caerphilly, designated on 16 September 1999.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Former Penllwyn Tramroad Viaduct at Nine Mile Point, Ynysddu, Caerphilly, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Transport
Date of designation
16 September 1999
Locality
Nine Mile Point
Community
Ynysddu
Unitary authority
Caerphilly
Country
Wales
Coordinates
51.61296, -3.15171
Cadw reference
22314

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1865 · England and Wales. England No. 6. (David Rumsey Map Collection, Stanford Libraries)
  • 1895 · Sheet 11. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1906 · 249 Newport (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1913 · Sheet 102. Newport. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

Crosses the River Sirhowy at Nine Mile Point, SE of Brynawel and SW of Wattsville.

Penllwyn Tramroad was built in 1824 along Sirhowy Valley near Blackwood to Nine Mile Point where it joined the Sirhowy Valley tramroad, which in turn joined the Monmouth Canal Company Tramroad. Promoted by John Jones of Llanarth Court and Sir Charles Morgan of Tredegar House, it provided an efficient link to the Sirhowy Tramroad from collieries on the Llanarth estate N of Blackwood. Fell out of use by 1864. In 1902 it was strengthened with a brick arch to carry heavier coal waggons from newly opened Nine Mile Point Colliery to the Sirhowy Valley Railway; this was laid in 1860 on the bed of the old Sirhowy Tramroad which had been built in 1805.

A high single span river arch of stone reinforced with brick and buttressed at each side. The arch has an impost band supproted by corbels; stone voussoirs of the earlier arch are visible above the later brick reinforcement with a string course above defining the parapet, which is railed and now carries a footpath. 4 deep stone abutments.

Listed as an important early tramroad structure with an impressive span to arch.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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