David - "Where Ships are Born" published in 1953 has the following information in it : "MacColl and Pollock, Ltd., started maring engine building at Wreath Quay on the North side of the river in 1894, under the style of Jameson and MacColl. At one time the firm employed 400 to 500 men, and before they closed down in March, 1935, they had engined 400 vessels. These included Canadian Lake steanmers, cargo boats, tugs, smalll passenger vessels, patrol gunboats in the 1914-18 war, and fast trawlers. From 1931 onwards only repair work was done, except for engining the Royal Lady pleasure steamer built by Crowns." Alan Vickers.