Intermodal freight transport is a system of interconnected networks involving various modes and facilities allowing transfer of commodities from one mode to another. The system aims to provide efficient, seamless transport of goods from the origin to its destination offering producers and manufacturers a full range of transportation modes and routing options. In this paper, we review the different modes of freight transportation in New Zealand as well as the current trends of mode share. A GIS-based optimisation model is created integrating road, rail and shipping network called the New Zealand Intermodal Freight Network (NZIFN). The resulting model uses deterrence parameters such as operational costs and time-of-delivery as well as energy consumption and emissions, evaluates trade-offs, and finds the most optimal route from a given origin to a destination. The model is applied to hypothetical scenarios of distribution from Auckland to Wellington and Auckland to Christchurch which demonstrates how freight mode