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.
In Castlehead's heyday, there were many significant players in the shipping industry. This might seem unusual now, but remember that until about two-thirds of the way into the twentieth century, the Clyde was one of the world's most active ports.