The term 'strong wagon' is often used to refer to a DRAY, which is a type of horse-drawn wagon used for transporting goods. The word 'DRAY' is derived from the Old English word 'dræge', meaning 'to draw or drag'. Drays were commonly used in the 18th and 19th centuries to transport goods such as coal, timber, and other heavy materials. They were also used to transport passengers, and were sometimes referred to as 'stage wagons'.