The Carnarvon and Llanberis railway bill passed through Parliament in 1864. The estimated cost of construction of the line long was £110,000 (). Construction started on 15 September 1864 when the first sod was cut by the Hon. Emily Wynne of Glynllifon, daughter of
Spencer Bulkeley Wynn, 3rd Baron Newborough. The event was marked with a procession of 700 children with the
Llanrug Brass Band, and the Revd. W. Lloyd William, vicar of
St Padarn's Church, Llanberis. The plan was for the railway to be operated by the
London and North Western Railway. The railway opened on 1 July 1869 but was overshadowed by a nitro-glycerine explosion at a quarry near
Cwm-y-Glo railway station which resulted in 5 deaths and 12 severe injuries. The line from Llanberis to Caernarfon was built from Llanberis towards
Caernarfon. For a while the railway terminated at
Caernarvon (Morfa) railway station. When the "Caernarfon Town Line" was built through a tunnel under the centre to join the various routes. Morfa station was closed on 5 July 1870, though it appears that formal paperwork was not concluded until the following January. In 1870 the
London and North Western Railway took full ownership of the line, and the Carnarvon and Llanberis Railway Company was dissolved. The railway was initially built as a local link between villages, serving the local population. However tourist traffic increased hugely after the
Snowdon Mountain Railway opened in 1897. ==Accidents==