The brothers separated their business association in 1850 and, after an acrimonious split, George took over the shipbuilding end of the association. James Thomas started a new business. George Thomson died in 1866, followed in 1870 by his brother James. They were succeeded by the sons of the younger brother George, called James Rodger Thomson and George Paul Thomson. Faced with the compulsory purchase of their shipyard by the Clyde Navigation Trust (which wanted the land to construct the new Princes' Dock), they established a new Clyde Bank Iron Shipyard further downriver at the Barns o' Clyde, near the village of Dalmuir, in 1871. This site at the confluence of the tributary River Cart with the River Clyde, at Newshot Island, allowed very large ships to be launched. The brothers soon moved their iron foundry and engineering works to the same site. The connection to the area was so complete that James Rodger Thomson became the first Provost of Clydebank. Despite intermittent financial difficulties the company developed a reputation based on engineering quality and innovation. The rapid growth of the shipyard and its ancillary works, and the building of housing for the workers, resulted in the formation of a new town which took its name from that of the shipyard which gave birth to it — Clydebank. In 1899 the steelmaker John Brown and Company of Sheffield bought J&G Thomson's Clydebank yard for £923,255 3s 3d.