Intermodal freight transport has received increased attention due to problems of road congestion, environmental concerns and traffic safety. A growing recognition of the strategic importance of speed and agility in the supply chain is forcing firms to reconsider traditional logistic services. As a consequence, research interest in intermodal freight transportation problems is growing. This paper provides an overview of planning decisions in intermodal freight transport and solution methods proposed in the scientific literature. Planning problems are classified according to the type of decision maker and decision level. General conclusions are given and subjects for further research are identified.