External effects or externalities "consist of the costs and benefits felt beyond or 'external to' those causing the effect" (Anderson, 2006). In the case of transportation, the negative externalities (costs) can take the form of air pollution, noise and accidents. Since external effects do not...

This paper addresses a hub-and-spoke network problem for railroad freight, where a central planner is to find transport routes, frequency of service, length of trains to be used, and transportation volume. Hub-and-spoke networks, often found in air freight, have not been favoured by railways in...