Operation of freight railways in densely used mixed traffic networks – An impact model to quantify changes in freight train characteristics

Fumasoli, Tobias; Bruckmann, Dirk; Weidmann, Ulrich

doi:10.1016/j.retrec.2015.10.021

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…On the other hand, simulation in customer service systems, the flow of customers in a service system has been analyzed [12,13] as well as evaluating staffing strategies [14][15][16] waiting times [17,18] and resource distribution to optimize customer satisfaction [19,20] as well as in logistics systems [21,22]. Another area widely studied with simulation is vehicle flow systems in a transportation network [23][24][25] modeling traffic and intersections [26][27][28][29][30][31], and modeling public transportation systems [32][33][34][35][36], as well as health systems [37,38].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Processing Times and Economic Feasibility to Produce Moringa Oleifera Lam. Capsules in Mexico.

Delfín-Portela,

Meléndez-Armenta,

Gurruchaga-Rodríguez

et al. 2024

Preprint

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The production of Moringa oleifera capsules has emerged as a promising agricultural activity in Mexico, driven by the plant’s well-documented health and nutritional benefits. In response, farmers have begun producing Moringa oleifera as a dietary supplement, using artisanal methods with minimal production controls. This study aimed to estimate the processing times of the Moringa oleifera production system using simulation modeling with Arena® software, and to evaluate the economic feasibility of capsule production. Methodologically, it was approached as a case study in the state of Veracruz, processing times were estimated through systematic sampling and modeled with Arena simulation software. Three simulation scenarios were considered to select a technically and economically viable alternative for agricultural producers: one with a 200-capsule encapsulator (1E200C), another with two 200-capsule encapsulators (2E200C) and a third with an 800-capsule encapsulator (1E800C). For the initial diagnosis a research stay was conducted for 180 days, and the production capacity was set at 24,000 capsules due to raw material limitations. Results indicated that the 1E800C scenario reduced processing time by 60% compared to the1E200C scenario, and by 35% compared to the 2E200C scenario. Additionally, the 1E800C model required only 2 days (16 hours) of work, while the 2E200C required 4 days (32 hours), and the 1E200C required 7 days (56 hours). In terms of production costs per unit of 90 capsules, the 1E200C was 3.93 USD the 2E200C 3.64 USD and the 1E800C 3.45 USD The study concluded that due to raw material limitations, the company can produce 12,800 units per year of 90 capsules. It is recommended to adopt the 1E800C encapsulator, which would lower overall production costs by 12.23%, representing 0.48 USD per unit produced, resulting in an additional profit of 6,150.50 USD Over a five-year evaluation period, the benefit-cost ratio was 5.03, the NPV was 922,370.11 and the IRR was 42.09%, indicating that this type of agribusiness in Mexico is both technically and economically feasible.

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Section: Introductionmentioning

confidence: 99%

Estimation of Processing Times and Economic Feasibility to Produce Moringa Oleifera Lam. Capsules in Mexico.

Delfín-Portela,

Meléndez-Armenta,

Gurruchaga-Rodríguez

et al. 2024

Preprint

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“…11 Lera-Lopez et al 12 adopted both double-hurdle and Moulton's models to evaluate the willingness of populations who live next to roads to pay for the negative externality costs generated by logistics activities. Fumasoli et al 13 established an impact model to determine the effects of the characteristics of freight trains on capacity consumption in mixed traffic railway networks, and the result shows that the use of freight trains can reduce the relative capacity consumption of freight trains and can reduce freight transport negative externalities. Meersman et al 14 analyzed how to mitigate negative externalities associated with land-based transport by taking a micro-research approach and proved that road pricing has a potential impact on the cost function of logistics.…”

Section: Introductionmentioning

confidence: 99%

Internalization of negative external cost of green logistics and incentive mechanism

Wang

Tsai

et al. 2017

Advances in Mechanical Engineering

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The implementation of green logistics can reduce increasingly serious environmental damage while improving the operating efficiency of logistics enterprises. In this article, through quantitative calculation of logistics negative external costs, including traffic accidents, atmospheric pollution, noise pollution, and pollution caused by packaging, we build accounting standards to calculate the negative external costs of logistics enterprises that generate pollution mainly from transportation and packaging. Then, assuming the impetus provided by the government implementing incentive mechanisms in a free market economy, we establish a ''Logistics Negative External Cost Internalization'' model. This model quantitatively analyzes the relationships among freight rate, freight volume, investment of enterprise for implementing green logistics, and the subsidies given by government, under the comparison of the two modes ''enterprise operates first'' and ''government subsidizes first.'' The results show that the introduction of the ''government subsidizes first'' incentive mechanism and increasing freight rate are helpful in promoting the process of logistics market greening.

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“…Prior studies on train scheduling attempted to maximize the number of trains by considering operational solutions for a single-track railway system [2,3] determining the optimal running time, minimum headway, and capacity on a block length basis [4][5][6] for trains operating with the same speed [7] and different speeds [8][9][10] and using blocking time models [11][12][13]. Studies on train scheduling and blocking time particularly benefited railway simulation [14].…”

Section: Introductionmentioning

confidence: 99%

Determining Critical Rail Line Blocks and Minimum Train Headways for Equal and Unequal Block Lengths and Various Train Speed Scenarios

Sangphong¹,

Siridhara²,

Ratanavaraha³

2017

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This paper presents a primary model to maximize rail line capacity by minimizing the train headway, defining block time as the time when a train first enters until it leaves the block. The analysis was conducted under a fixed-block system, which allows only a single train to remain in the block. A critical block was identified to determine the minimum safe headway as a function of the train speed, train length, number of trains, and block length. A time-distance diagram was used to analyze operations with equal and unequal block lengths. For two trains operating at the same speed on unequal blocks, the maximum block length defined the minimum headway. For two trains operating at different speeds, a hierarchical analysis was required to identify the minimum headway. Shorter block lengths and a strategic train order affected rail line capacity. The maximum capacity was achieved when two trains operated at the same speed.

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Operation of freight railways in densely used mixed traffic networks – An impact model to quantify changes in freight train characteristics

Cited by 15 publications

References 9 publications

Estimation of Processing Times and Economic Feasibility to Produce Moringa Oleifera Lam. Capsules in Mexico.

Estimation of Processing Times and Economic Feasibility to Produce Moringa Oleifera Lam. Capsules in Mexico.

Internalization of negative external cost of green logistics and incentive mechanism

Determining Critical Rail Line Blocks and Minimum Train Headways for Equal and Unequal Block Lengths and Various Train Speed Scenarios

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