Abstract
Since railway transport possesses the advantage of high volume and low carbon emissions, diverting some freight from road to railway will help reduce the negative environmental impacts associated with transport. This paper develops a flow assignment model for quantitative analysis of diverting truck freight to railway. First, a general network which considers road transportation, railway transportation, handling and transferring is established according to all the steps in the whole transportation process. Then general functions which embody the factors which the shippers will pay attention to when choosing mode and path are formulated. The general functions contain the congestion cost on road, the capacity constraints of railways and freight stations. Based on the general network and general cost function, a user equilibrium flow assignment model is developed to simulate the flow distribution on the general network under the condition that all shippers choose transportation mode and path independently. Since the model is nonlinear and challenging, we adopt a method that uses tangent lines to constitute envelope curve to linearize it. Finally, a numerical example is presented to test the model and show the method of making quantitative analysis of bulk freight modal shift between road and railway.
Highlights
In recent years, road transport made great contribution to our society
Reducing the carbon emissions of inland transportation system by optimizing the share of freight flow between road and railway becomes an important issue for developing low-carbon transportation
This paper mainly focuses on the freight flow assignment model for simulating the flow distribution on road and railway network
Summary
Road transport made great contribution to our society. some negative effects such as air pollution, energy consumption and so on emerged . Flow assignment model for road and railway transportation, the capacity of inland waterways is usually limited. This paper studies the flow assignment problem on road and railway network from the perspective of shippers’ choosing transport mode and path. With this knowledge, a flow assignment model is constructed which considers handling cost, transfer cost, congestion cost, and capacity limitation. A flow assignment model is constructed which considers handling cost, transfer cost, congestion cost, and capacity limitation This model will provide theoretical support for related administrators as well as obtain the flow distribution on road and railway network under various circumstances
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