Urban freight transport using passenger rail network: Scientific issues and quantitative analysis

Behiri, Walid; Belmokhtar-Berraf, Sana; Chu, Chengbin

doi:10.1016/j.tre.2018.05.002

Cited by 146 publications

(73 citation statements)

References 44 publications

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“…In this section, we discuss the optimal timetable when both passenger and freight service are provided, assuming inelastic demands and fixed number of trains. In practical railway operation and literature of freight train scheduling (e.g., Behiri et al [11]), either passenger or freight trains are commonly departing in a concentrated time interval. Such service pattern does not necessarily to be optimal in terms of social cost.…”

Section: The Optimal Timetable For Track Sharing Servicesmentioning

confidence: 99%

“…The second stage is to schedule (or path) different types of trains to minimize the deviation from the designated optimal timetable, subject to track and headway constraints (e.g., Carey and Lockwood [8], Carprara et al [9], and Cacchiani and Toth [10]). As a variant of the second stage scheduling problem, Behiri et al [11] develop a model for optimal train scheduling specifically in the context of FOT, assuming that the departure times of passenger trains are unaffected. Recently, Robenek et al [12] made an effort to integrate the two stages of the optimal timetable problem, where the second stage of train scheduling also affects passengers' departure time choice.…”

Section: Introductionmentioning

confidence: 99%

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On the Pricing of Urban Rail Transit with Track Sharing Freight Service

2020

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Transporting parcels on urban passenger rail transit is gaining growing interest as a response to the increasing demand and cost of urban parcel delivery. To analyze the welfare effects of different fare regimes when allowing parcel services on an urban rail transit, this paper models the optimal service problem where the transit operator chooses the number of trains and the departure intervals. By introducing a reduced form train timetable problem, the passenger train crowding model is extended to incorporate the effect of freight train scheduling. We show that the freight users are better off in the time-varying optimal fare regime, while passengers are worse off, and that the time-varying optimal fare regime calls for more trains than the optimal uniform fare regime. However, the reduction in passenger trains due to the introduction of freight service can eliminate the welfare gain from passenger time-varying fare. If the price elasticity of freight demand is relatively high, implementing road toll can generate welfare loss when rail transit is privately operated.

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Section: The Optimal Timetable For Track Sharing Servicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Pricing of Urban Rail Transit with Track Sharing Freight Service

2020

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“…In recent years, with the United States [30], France [31], Singapore [32], and China [33] have launched the feasibility study of ULS project, the situation gradually improved. The initial project license is clearly insufficient to support the actual implementation of the ULS project.…”

Section: Policy Supportmentioning

confidence: 99%

The Impact of Underground Logistics System on Urban Sustainable Development: A System Dynamics Approach

et al. 2019

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The lack of practical application and accurate benefit analysis, which are the prerequisites for each other, make it difficult to implement and promote the underground logistics system (ULS), although in theory people always recognize its advantages in sustainable improvement of urban transportation and logistics. This paper attempts to use the system dynamics (SD) method, based on the real-world simulation, to analyze the quantitative relationship between the implementation strategy of ULS and the sustainability of urban transportation and logistics to solve this problem. Beijing city, China, was selected as the empirical background. Four ULS implementation strategies were proposed according to the city's potential investment in ULS and its demand for ULS network capacity. Meanwhile, four representative indicators were selected to evaluate the simulation results, including the average speed of the road networks in the peak hour, congestion loss, delivery travel time in the peak hour and the PM emissions of the truck. Good fitting index of historical data shows the validity of the model. Simulation results show that ULS, as a supplement to the urban integrated transport system, can significantly improve urban traffic and logistics. This study provides a perspective in the systematic and quantitative analysis of ULS to support the urban sustainable development.

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“…The EGR system shows a different reduction in cycle pressure [10] which is noticeable when operating small engines [11]. Studies [12][13][14][15] shows that the basic operating modes of both freight and passenger vehicles moving in cities are part speed and loading modes. They involve acceleration, steady mode, and active and forced idling while driving and braking the car.…”

mentioning

confidence: 99%

“…This is particularly emphasized in the context of the development of smart cities, where freight delivery can be modeled on special robotic vehicles [12]. It is important to emphasize that the use of such transport is specialized and more tailored to individual customers, with a higher standardized freight flow due to the limited engine described above and the rail network used [13]. Nevertheless, the combined approach to passenger and freight transport is widely developed [14].…”

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confidence: 99%

Improving Fuel Economy of Spark Ignition Engines Applying the Combined Method of Power Regulation

et al. 2020

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One of the disadvantages of spark ignition engines, whose power is regulated by throttling, is the increased fuel consumption at low loads and when the engine is idle. The combined method of engine power regulation by switching off the cylinder group and throttling working cylinders is one of the effective ways to improve fuel economy in the above-mentioned modes. This article presents the research results of the combined method of engine power regulation which can be realized by minor structural changes in operating conditions. The method implies the following: at low loads and at idle speed of the engine. Fuel supply to the group of cylinders is switched off with the simultaneous increase of the cyclic fuel supply in the working cylinders. The adequacy of the calculated results has been checked by the indication of operating processes in switched off and working cylinders. The research results of a six-cylinder spark ignition engine with the distributed gasoline injection using the combined power regulation system have been shown. The angles of opening the throttle which provides a non-shock transition from the operation with all cylinders to the operation with the cylinder group switched off have been determined.Energies 2020, 13, 1076 2 of 19 forced idling. In this case, most of the time cars move at a low speed, with the engine running at low loads and at idle speed.Operating modes of automobile engines under operating conditions have been investigated in many papers. At low speed and low load, high heat transfer and combustion losses occur, directly affecting engine operating conditions [1]. In most cases, these actual engine operating conditions are not reflected in standardized driving cycles and, sometimes, summaries of experimentally-derived cycles are also used to evaluate traffic jams [2]. Design changes, such as ceramic-coated engines, have also been used to reduce heat loss, which, when used in combination with biodiesel as fuel, have shown optimum engine operating conditions [3]. This effect is also noticeable when using triglyceride-based biodiesel as fuel [4]. Hydroxyl gas can also be used as an indicator to improve engine natural conditions, resulting in higher thermal efficiency and improved exhaust emissions [5]. The possible use of biobutanol as another source of biofuels and similar trends in engine operating conditions due to its higher oxidative stability [6] as a spark ignition [7], as a compression ignition engines [8]. It is also known that the use of alcohol additives in petrol improves its properties and achieves an ecological effect [9]. The EGR system shows a different reduction in cycle pressure [10] which is noticeable when operating small engines [11]. Studies [12][13][14][15] shows that the basic operating modes of both freight and passenger vehicles moving in cities are part speed and loading modes. They involve acceleration, steady mode, and active and forced idling while driving and braking the car. Most of the time the vehicular engines run the open throttle or with a fuel s...

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Urban freight transport using passenger rail network: Scientific issues and quantitative analysis

Cited by 146 publications

References 44 publications

On the Pricing of Urban Rail Transit with Track Sharing Freight Service

On the Pricing of Urban Rail Transit with Track Sharing Freight Service

The Impact of Underground Logistics System on Urban Sustainable Development: A System Dynamics Approach

Improving Fuel Economy of Spark Ignition Engines Applying the Combined Method of Power Regulation

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