Cwm-y-glo Welsh: Cwm-y-glo
Capel Tabernacl
Cwm-y-glo Location within Gwynedd
Population	995
Language	Welsh (72.1%)
OS grid reference	SH551626
Community	Llanrug
Principal area	Gwynedd
Country	Wales
Sovereign state	United Kingdom
Post town	CAERNARFON
Postcode district	LL55
Dialling code	01286
Police	North Wales
Fire	North Wales
Ambulance	Welsh
UK Parliament	Arfon
Senedd Cymru – Welsh Parliament	Arfon
Website	https://llanrug.cymru/
List of places UK Wales Gwynedd 53°08′28″N 4°09′58″W / 53.141°N 4.166°W / 53.141; -4.166

Cwm-y-glo is a small village in Wales, 4+1⁄2 miles (7 km) east of Caernarfon, between Llanberis and Llanrug. It is in the Arfon Parliamentary constituency, the community of Llanrug, and the Gwynedd Council electoral ward. Cwm-y-glo ward includes Ceunant and Pont-rug and has a population of around 1,000.^[1]

The focus of the village is on the original roadway, now bypassed by the A4086 road, which follows the approximate line of the former railway.

To the east of the village lies the flood plain of Afon Rhythallt (an extension of the Afon Seiont) and consequently some houses on the eastern side of the old road (which lie below the level of the main road) suffer flooding.

The village is mainly residential, but has a number of shops and small businesses. Menter Fachwen is a local charity offering work to adults with disabilities.

The community is policed from Llanberis and has a dedicated Community Beat Manager.

The origin of the village's name ("Valley of Coal") lies in its connection with the extensive slate industries which thrived in the valley in 18th, 19th and early 20th centuries. The area was home to the charcoal sub-industry, which the foundries at the various quarries depended on to fabricate iron to support the slate industry.

On 30 June 1869, two carts carrying nitroglycerine explosive collided in the village; the resulting explosion killed the carters as well as three others and injured a further eight. The explosion was at the time believed to be the loudest manmade explosion ever, and the debris, allegedly including a cart wheel, was thrown as far as the next village, Brynrefail. To this day an X is inscribed on a wall at Clegir along the old road between Bryn Bras Castle and Llanberis, marking the spot where a wheel and harness from one of the carts was flung.^[2][3] In April 2008 a plaque commemorating the tragedy was unveiled on the rock face opposite Y Fricsan, the village pub.^[4]

Between 1865 and 1965 an LNWR 8-mile (13 km) branch railway line ran through the village from Llanberis to Caernarfon, but there are no longer any visible remains of Cwm-y-glo railway station. The line was established by the Caernarvon and Llanberis Railway Act 1864.

• www.geograph.co.uk : photos of Cwm-y-glo and surrounding area
• North Wales Police Archived 13 August 2009 at the Wayback Machine