Added to this were brickyards, tanneries, glaziers, breweries, lime kilns and soap factories. Manufacturing plants include brickyards, sawmills, furniture manufacturing, and food-processing plants. There was a gristmill, two brickyards, a tannery, and eighteen shipbuilders. These included a pig iron furnace, coke ovens, a tannery, brickyards, dairies, and others. Former industries included paper, flour, cotton, woolen mills, steel works, and brickyards. As time passed, steel mills and brickyards closed and industries changed, replaced by new activities. There were four brickyards, producing engineering bricks (Enfields, Whinney Hills) and specials. Over 150 slaves, three of them child laborers, were freed from these illegal brickyards. Two local brickyards produced the bricks of which many Conestogo buildings were constructed. Most of the Roman bricks were created at brickyards. The single track now disappears into the houses built on the brickyards on Somerville Road. There have been continuing reports of cruelty committed at these illegal brickyards since 2004. Reporters later visited many illegal brickyards in Yuncheng and Jincheng. Material was close at hand in the brickyards. The several large brickyards around Causeway Street were owned by a few wealthy families.