De Winton

They built, amongst other things, vertical boilered narrow gauge locomotives for use in Welsh slate mines and other industrial settings.

At the large and very profitable Dinorwic Quarry in Llanberis, in 1870, De Winton's built and equipped an entire workshop with machinery powered by overhead shafting that in its turn was driven by the largest water wheel in the United Kingdom (over 50 feet in diameter), which remained in daily use until 1925 when it was replaced by a Pelton wheel but retained as standby.

Jeffreys Parry de Winton (born Wilkins 1828–1892) was mayor of Caernarfon (1870–1872) when his company was one of the rising enterprises in the town.

In its decline from that time it appears to have been badly managed and heavily committed to a French invention that failed and brought bankruptcy in 1901.

The steam engine at Glynllifon was restored by Fred Dibnah after he was originally called to the park to quote for the demolition of the chimney.

Part of De Winton's works on the quay at Caernarfon from the platform of the Welsh Highland Railway station
Chaloner , a De Winton locomotive resident at the Leighton Buzzard Light Railway