Intermodal transport systems are complex to manage and design. Intermodal transport systems are complex systems that involve a multitude of actors and possible decision making. Intermodal transport models can work on any or all three levels and are divided into three main types of models: strategic, tactical and operational models. When building an intermodal transport model, the input data availability must also be considered. Simplifications in intermodal transport models can take many forms. Some are derived from the question to answer, but others have more practical reasons. In general, intermodal transport models are used as decision support systems (DSS) to help support decisions. This chapter gives an example of one extensive stand-alone modelling system, the geographic information systems (GIS)-based location analysis model for Belgian intermodal terminals (LAMBIT). The main goal of this model is to provide evaluations of policies that could possibly affect the use of intermodal transport.