Infrastructure systems for generalized transportation – such as goods, passengersand water – take the form of networks. These networks typically haveinterdependencies which are not addressed in engineering practice. In order tomake efficient policy regarding an infrastructure system, the impacts of thatpolicy on other interdependent infrastructure systems must be understood. Thecombination of the different layers of the interconnected infrastructure networkmay be thought of as a system of systems representing the grand infrastructuresystem. Users of the system of systems may be thought of as agents competingfor the limited capacities of the network layers. Dynamic game theory is a naturalmethod for modeling systems of systems in an effort to make better infrastructuredecisions. However, to be of use, these models must be computable and thussome different solution techniques for general equilibrium models are discussed.