منابع مشابه
Single-Car Routing in Rail Freight Transport
Cars in rail freight service follow prescribed routes from their origin via intermediate shunting yards to their destination. The goal in designing such routes is to reduce the number of trains and their travel distances. Various real-world hard constraints make the problem difficult to formulate and also to solve. We present integer programming formulations for this car routing problem arising...
متن کاملFreight car dispatching with generalized flows
In the freight car dispatching problem empty freight cars have to be assigned to known demands respecting a given time horizon and certain constraints. The goal is to minimize the resulting transportation costs. One of the constraints is that customers can specify the type of cars they want. It is possible, however, that cars of certain types can be substituted by other cars, either in a 1-to-1...
متن کاملScheduling Locomotives and Car Transfers in Freight Transport
We present a new model for a strategic locomotive scheduling problem arising at the Deutsche Bahn AG. The model is based on a multi-commodity min-cost flow formulation that is also used for public bus scheduling problems. However, several new aspects have to be additionally taken into account, such as cyclic departures of the trains, time windows on starting and arrival times, network-load depe...
متن کاملA Numerical Model for Railroad Freight Car-to-Car End Impact
A numerical model based on Lagrange-D’Alembert principle is proposed for car-to-car end impact in this paper. In the numerical model, the friction forces are treated by using local linearization model when solving the differential equations. A computer program has been developed for the numerical model based on Runge-Kutta fourth-order method. The results are compared with the Multibody Dynamic...
متن کاملSupply Chain Simulation for Modeling the Interactions in Freight Movement
Freight movement is a dynamic process involving with complex interaction among many agents by which the commodities are flowed through supply chains. Simulation based model allows such dynamic and complex interaction system to be undertaken. Simulation based multi-agent approach is therefore utilized to model the behaviors of agents and their interactions in supply chains in order that the mech...
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ژورنال
عنوان ژورنال: Journal of Agricultural and Applied Economics
سال: 1971
ISSN: 1074-0708,2056-7405
DOI: 10.1017/s0081305200010293