Shunting Minimal Rail Car Allocation

We consider the rail car management at industrial in-plant railroads. Demands for materials or empty cars are characterized by a track, a car type, and the desired quantity. If available, we assign cars from the stock, possibly substituting types, otherwise we rent additional cars. Transportation requests are fulfilled as a short sequence of pieces of work, the so-called blocks. Their design at a minimal total transportation cost is the planning task considered in this paper. It decomposes into the rough distribution of cars among regions, and the \NP-hard shunting minimal allocation of cars per region. We present integer programming formulations for the two problem levels. Our computational experience from practical data encourages an installation in practice.

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Dept. Mathematical Optimization, Braunschweig University of Technology, June 2003

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