History in Structure

This site is entirely user-supported. See how you can help.

Pandy Mawr Railway Arch

A Grade II Listed Building in Bedwas, Trethomas and Machen (Bedwas, Tretomos a Machen), Caerphilly

More Photos »
Approximate Location Map
Large Map »


Latitude: 51.5979 / 51°35'52"N

Longitude: -3.2124 / 3°12'44"W

OS Eastings: 316122

OS Northings: 189481

OS Grid: ST161894

Mapcode National: GBR HW.BJPR

Mapcode Global: VH6DT.83MC

Plus Code: 9C3RHQXQ+53

Entry Name: Pandy Mawr Railway Arch

Listing Date: 9 January 1989

Last Amended: 8 February 1999

Grade: II

Source: Cadw

Source ID: 13575

Building Class: Transport

Location: The arch runs over the valley road leading N from Bedwas to Cwm y Bwch. Site of Bryngwyn Colliery to the SE.

County: Caerphilly

Town: Caerphilly

Community: Bedwas, Trethomas and Machen (Bedwas, Tretomos a Machen)

Community: Bedwas, Trethomas and Machen

Locality: Pandy Mawr

Built-Up Area: Caerphilly

Traditional County: Monmouthshire

Find accommodation in


Originally constructed for the Rumney Railway Co between 1824 and 1829. Converted from a tramroad by the Brecon and Merthyr Tydfil Junction Railway Co who opened a freight and passenger service in 1863. The style of the masonry suggests that it was rebuilt in the latter half of the C19, perhaps during 1863 to ease the curve of the new railway.


Single, long, narrow arch for roadway supporting former railway embankments which rise high above. Round-headed arch rings to each portal. Rock-faced masonry voussoirs with keystones. Snecked facings to spandrels. Flanking raking buttresses with flat stone copings. Snecked masonry, without breaks, to long interior. Wide embankments at various levels formerly carried tramroad and railway lines through the Rhymney Valley.

Reasons for Listing

Listed as an unusual railway structure, the 1820s tramroad origins being of special interest.

Recommended Books

Other nearby listed buildings

BritishListedBuildings.co.uk is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact BritishListedBuildings.co.uk for any queries related to any individual listed building, planning permission related to listed buildings or the listing process itself.

British Listed Buildings is a Good Stuff website.