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With 8,000 inhabitants, Merthyr Tydfil was the largest town in Wales during the 19th century. The town, appearing towards the right-hand margin, had access to large supplies of iron and coal, attracting ironmasters and ironworkers from miles away with the promise of high wages and good housing. A network of tramroads, the horse-worked railways that predated the locomotive era, was laid out to transport coal and ore from the pits to the iron works. The drawing indicates these tramroads with double dotted lines. Mines are shown as dots within circles.