By the second quarter of the 18th century, a number of private coal pits were operating on a commercial scale in a coalfield located in the area now known as Midlothian. Miners immigrated to Chesterfield from Wales, England and Scotland. The Wooldridge family from East Lothian in Scotland was among the first to undertake coal mining in the area. The mining community was originally called Coalfield after Coalfield Station, a railroad station on the Richmond and Danville Railroad (now Norfolk Southern Railway). Eventually the name changed from Coalfield Village to Midlothian Village, named after the Wooldridge brothers' Mid-Lothian Coal Mining Company and Abraham S. Wooldridge's house, Midlothian. The Heths, beginning with Colonel Henry "Harry" Heth, who was born about 1760, opened coal pits in the county as early as 1785.