History in Structure

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Lower Viaduct

A Grade II Listed Building in Llanberis, Gwynedd

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Latitude: 53.1139 / 53°6'50"N

Longitude: -4.1227 / 4°7'21"W

OS Eastings: 258018

OS Northings: 359522

OS Grid: SH580595

Mapcode National: GBR 5Q.7T5J

Mapcode Global: WH54M.MZZN

Entry Name: Lower Viaduct

Listing Date: 28 May 1999

Last Amended: 28 May 1999

Grade: II

Source: Cadw

Source ID: 21851

Building Class: Transport

Location: Located towards the foot of the Snowdon Mountain Railway where it crosses the road and begins to ascend rapidly in height.

County: Gwynedd

Town: Caernarfon

Community: Llanberis

Community: Llanberis

Built-Up Area: Llanberis

Traditional County: Caernarfonshire

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An original structure on The Snowdon Mountain Railway, which was founded as the Snowdon Mountain Tramroad & Hotels Co. Ltd. in 1894 and opened in 1896. The engineers were Douglas and Francis Fox and the line was originally operated by 5 steam locomotives from Switzerland on the rack and pinion system first devised by Dr Roman Abt of Lucerne. Purely recreational in use, the line has always been a major attraction to tourists visiting the area.


Railway viaduct comprising 13 skewed round-headed arches rapidly increasing in height to incline, with a further half arch above the natural rock to the top end. Snecked rock-faced rubblestone blocks with heavily tooled ashlar coping and toothed purple brick to arches.

Reasons for Listing

Included as a major engineering structure on the pioneering Snowdon Mountain Railway.

Other nearby listed buildings

  • II Engine Shed
    Located at the foot of the Snowdon Mountain Railway directly to the south of Llanberis Station; a water tank manufactured by Bolling & Lowe of London is situated at the north-west corner of the shed.
  • II Waterfall Viaduct
    Located above the spectacular waterfalls of Afon Hwch immediately to the north of Waterfall Station on the Snowdon Mountain Railway.
  • II Royal Victoria Hotel
    Situated on slightly rising ground at the south-eastern approach to Llanberis.
  • II Dolafon
    Located on the south-west side of Stryd Fawr (High Street), set back from the road in a stone-walled garden with several tall trees.
  • II* Church of St Padarn
    Located in a a prominent position on rising ground behind the Dolbadarn Hotel on the south side of Stryd Fawr (High Street); the churchyard is of irregular shape and is approached from the north throu
  • II Bryn Eithin
    Set back on north side of main road in Pentre-castell at left end of terrace of cottages; separated from other cottages by high rubblestone wall, which along with similar wall to road encloses front g
  • II Capel Jerusalem with former domestic accommodation to rear
    Located at the eastern end of Pentre-castell on the north side of the A 4086 immediately south of Dolbadarn Castle; a low rendered wall with iron gates forms a small forecourt to the street.
  • II* Capel Coch
    Situated on very slightly rising ground on the south side of Ffordd Capel-Coch, the chapel occupies a prominent position in the street; low rubblestone wall to street continues to east to enclose fore

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