A wagon has two side walls, two end walls and a base. At least a portion of one or each side wall has two side wall parts in the form of panels. Each panel has a respective constant wall thickness and is joined together. In some embodiments, the panels can be integrally formed. The side wall panels are also each of a different material thickness. A bridging member in the form of an angled bracket is arranged to interconnect the respective side wall panels by being separately connected to each side wall panel.