Six principles for the design of transport systems are described, including direct link, corridor, hub-and-spoke, connected hubs, static routes, and dynamic routes. The designs are theoretically discussed, defining the operational character of each design and their application in passenger, freight and rail freight transport. The theory is then applied to intermodal freight transport by comparing the terminology used in the paper with that in the scientific literature. The advantages of using a generic terminology over contextual ones are identified from the perspectives of researchers, commercial operators and policy-makers.