 In 1814 the company produced the iron work for Vauxhall Bridge over the River Thames.The company also owned Hilt's Quarry at Crich, which supplied limestone for the ironworks and for the limekilns at Bullbridge, providing lime for farmers and for the increasing amount of building work.The steep wagonway to the Cromford Canal at Bullbridge was called the Butterley Gangroad and incorporated the world's oldest surviving railway tunnel, at Fritchley (built 1793).