Castlehead in its heyday had several major players in the shipping industry. If that seems surprising today, bear in mind that until two thirds of the way through the twentieth century the Clyde was one of the world's busiest ports.
Castlehead, at its peak, had several prominent figures in the shipping industry. The significance of this is that it contrasts with the current situation where the Clyde was a major port until roughly two-thirds of the way through the twentieth century.