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Cof Cymru: National Historic Assets of Wales · Wales

Western Portal of Penmaen Rhos Railway Tunnel

Old Colwyn, Conwy, Wales

A Grade II listed building in Old Colwyn, Conwy, designated on 9 September 1994.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Western Portal of Penmaen Rhos Railway Tunnel, Old Colwyn, Conwy, 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
Domestic
Date of designation
9 September 1994
Locality
Old Colwyn
Community
Old Colwyn
Unitary authority
Conwy
Country
Wales
Coordinates
53.29291, -3.68297
Cadw reference
14862

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 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 95 Rhyl (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

At the western mouth of the railway tunnel.

The Chester to Holyhed Railway was proposed to improve links between London and Dublin, with George Stephenson as engineer, Francis Thompson as architect. Work began in 1845 and the line was opened as far as Bangor in 1848. The 486 yard Penmaen Rhos Tunnel was bored through limestone.

White limestone, ashlar over arch, rusticated to terminal piers, and coursed and squared to parapet. Shallow segmental arch with stepped moulded cornice over, between terminal turretted piers, which are rectangular in section, and have machicoated embattled heads.

A distinctive example of railway architecture, dating from the original period of
construction of the line and probably designed by Stephenson or Thompson.

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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