A dray is a strong cart or wagon used to carry heavy loads. It is a type of vehicle made for work, not for everyday travel by people. They were pulled by big, strong horses. Sometimes teams of four or more horses were used for particularly heavy loads.
The dray in the photo would have been used for moving barrels of beer, which are very heavy.
The dray in the photo would have been used for moving barrels of beer, which are very heavy.