A Linear Programming Model for Cargo Movement Evaluation

A linear programming model is presented for minimizing the steady state cost of moving cargo carriers over certain routes subject to numerous constraints on both the cargo and carrier movement. There are several types of cargo and carriers, transshipment is allowed, cargo and carriers are linked by capacity constraints, and requirements are specified in terms of movement from a specified origin to a specified destination. The model is fairly general in that it should be applicable to certain types of cargo movement via either air or surface transportation. Studies that can be made by use of the model include (i) cost-effectiveness analyses of policy questions (such as those involving utilization rates and frequency requirements), as well as evaluation of alternatives for (ii) mix of cargo carriers, (iii) best routes for certain carriers, (iv) mix of bases or depots, (v) transshipment policy, and (vi) physical and operating characteristics of carriers.