The Marquess of Bute, who owned much of the land north of Cardiff, built a steam railway system on his land that stretched from Cardiff into many of the South Wales Valleys where the coal was being found. Lord Bute then charged fees per ton of coal that was transported out using his railways. With coal mining and iron smelting being the main trades of south Wales, many thousands of immigrants from the Midlands, Scotland, Ireland, Cornwall and even Italy came and set up homes and put down roots in the region. Very many came from other coal mining areas such as Somerset, the Forest of Dean in Gloucestershire and the tin mines of Cornwall such as Geevor Tin Mine, as a large but experienced and willing workforce was required. Whilst some of the migrants left, many settled and established in the South Wales Valleys between Swansea and Abergavenny as English-speaking communities with a unique identity. Industrial workers were housed in cottages and terraced houses close to the mines and foundries in which they worked. The large influx over the years caused overcrowding which led to outbreaks of Cholera, and on the social and cultural side, the near-loss of the Welsh language in the area.