Analyzing the transition from single- to double-track railway lines with nonlinear regression analysis

Sogin, Samuel L.; Lai, Yung‐Cheng; Dick, C. Tyler; Barkan, Christopher P. L.

doi:10.1177/0954409715616998

Cited by 14 publications

(20 citation statements)

References 13 publications

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“…Much like the results obtained by Sogin et al (Model 1), there appears to be a linear response of train delay to additional sections of double track [1]. However, the delays, in absolute terms, are much higher in value than those obtained for Model 1, which included sidings spaced closer together (10 miles oncenter as opposed to 16).…”

Section: Impact Of Initial Siding Spacingsupporting

confidence: 68%

“…The delay characteristics for single-track mainlines have been well-covered in existing literature, and such research has been extended into studies on the delay benefits of double-track installation. The subsequent analyses provided in this research study are an extension of results obtained via the work developed by Sogin et al, where it was discovered that for idealized corridors with an even 10-mile siding spacing, double-track installation provided a linear reduction in train delay, measured in minutes, for differing levels of freight traffic [1]. The reductions in delay resulting from double-track installation are in keeping with the notion that train meets are the primary causes of delay, due to the fact that double track allows a larger proportion of trains to avoid meets altogether [2].…”

Section: Introductionmentioning

confidence: 60%

“…Model 1 was simulated by Sogin et al, whose results were documented and, as mentioned previously, showed a linear reduction in train delay as a function of percent double track [1]. Model 2 is constructed as a means of identifying the difference in delay patterns for a route that has longer bottleneck sections (i.e.…”

Section: Impact Of Initial Siding Spacingmentioning

confidence: 90%

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Siding Spacing and the Incremental Capacity of the Transition From Single to Double Track

Atanassov

Dick

Barkan

2014

2014 Joint Rail Conference

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The North American freight railroad network is projected to experience rising transportation demand in the coming decades, leading to increased congestion along many rail corridors. Increased interest in expanded passenger service on shared rail corridors will also create additional capacity demand. However, the nation’s rail lines are still predominantly single track with passing sidings, making double track installation a vital capacity upgrade measure to sustain future volumes. Since increasing capacity through double track installation requires significant capital investment, the second main track must be allocated along a line in an optimal manner to provide maximum return on investment. An approach of investing in the least costly segments first may yield good results, but only if the benefits for each segment are equal. This research seeks to identify if the benefit of double track varies between bottleneck segments, and if there are compounding benefits of double track between adjacent passing sidings. Previous research has explored the allocation of double track on an idealized line with evenly spaced passing sidings. Due to numerous physical and engineering constraints, existing lines often exhibit a mixture of siding spacing with single-track bottleneck sections of varying length. To investigate the incremental capacity of adding double-track segments to a route with variable siding spacing, several build-out strategies are tested on a representative subdivision under random, mixed freight and passenger traffic via Rail Traffic Controller simulation software. The presented results highlight the most effective method, based on train delay, of incremental single to double track expansion and the potential differences in benefit between strategies. The linear delay reduction characteristics of single-to-double track mainlines vary based on the initial spatial arrangement of passing sidings and amount of second main track installed. These results further the understanding of relationships between infrastructure location and freight delay, thereby serving as a guideline for the sustainable expansion of existing rail corridors in anticipation of future demands. While railroads must consider many factors in selecting capital expansion projects, these guidelines can streamline the decision process by helping to quickly identify the projects with the most potential for more detailed engineering evaluation. The methodology presented can eventually be incorporated into analyzing the progressions from double to triple track lines.

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Section: Impact Of Initial Siding Spacingsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 60%

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Siding Spacing and the Incremental Capacity of the Transition From Single to Double Track

Atanassov

Dick

Barkan

2014

2014 Joint Rail Conference

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“…Heavy investments are being made worldwide to increase speed on transportation networks. Travel time is of course dependent on distance, but for a given distance, travel on a high-speed dedicated railway line is much faster than the equivalent travel by road [82,83].…”

Section: Distributed Terminals Network Model For Beijingmentioning

confidence: 99%

Transportation Planning through GIS and Multicriteria Analysis: Case Study of Beijing and XiongAn

Farooq

Stoilova

Ahmad³

et al. 2018

Journal of Advanced Transportation

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Urban population growth and urbanization with its impact on urban planning require continuous research in order to address the challenges posed by transportation requirements. Identifying transportation capacity (road and railways) is an important task that can identify whether the network is capable of sustaining the present volume of traffic and whether it can handle the future intended traffic flow. A new city, XiongAn, will be built in the coming years in order to relieve the pressure of population on Beijing and disperse the economic growth, business activity, and opportunities across the country. The focus of this research is to generate a transportation model between Beijing and XiongAn, in order to increase connection and connectivity, reduce travel time, and increase transfer capacity between the two hubs (Beijing-XiongAn). The existing transportation network between two cities is analyzed and a network which can handle future demand has been proposed. The first stage has been the investigation of a variety of options using geographic information system (GIS). Planning and implementing a mass transit system requires choosing among options such as an existing intercity railway line, a new high-speed railway line, and/or motorway options. In the second phase of our analysis, we assess these options relative to multiple criteria, using the analytic hierarchy process (AHP). The options were evaluated using various criteria responsible for selection of alternative; it is found that travel time, cost of travel, safety, reliability, accessibility, and environment are key criteria for selecting the best alternative. The GIS and multicriteria analysis suggested that the best option is to build a new high speed railway line.

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“…When an alternate route is present, a reroute ratio, or ratio of the length of the alternate route to the length of the main route, is also specified. Base route characteristics are based on the work of Sogin et al to match the operating conditions for Equation 3 (32). Track possession, equipment setup times, tie renewal rates, tamping speeds and costs, and train weights are based on published values and industry averages and analyses (18,40,(42)(43)(44).…”

Section: Sensitivity Analysismentioning

confidence: 99%

Cost and Delay of Railroad Timber and Concrete Crosstie Maintenance and Replacement

Lovett

Dick

Ruppert

et al. 2015

Transportation Research Record: Journal of the Transportation R

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Because railroad crossties are the second most valuable railroad asset, it is critical that they be maintained and managed in a cost-effective manner. The direct expenses of track maintenance cost railroads billions of dollars each year, and additional millions are spent on recovery from track-caused derailments. Train delay costs further increase the con sequences of unplanned track outages. Additionally, maintenance activities often result in traffic disruptions and congestion that can propagate throughout the rail network; this effect is a concern especially on higher-density lines that are vulnerable to cascading train delay and longer postincident recovery times. Compared with timber crossties, concrete crossties offer several potential benefits but also have a greater initial cost. Economic analysis can show instances in which extra capital investment in premium components is justified. Such analysis can also aid in planning general tie maintenance by balancing the costs of added maintenance with the associated benefit of reduced accident risk. This paper presents a model for evaluating the life-cycle economics of tie types by comparing concrete and timber crossties. A sensitivity analysis demonstrates how various inputs affect the cost comparison between timber and concrete ties.North American railroads spend billions of dollars each year on track maintenance, and crossties are one of the largest expenditures (1). Hence crosstie investments should be made on the basis of sound economics and maintenance performed in the most cost-effective manner. Track maintenance strategies differ in how frequently various components are renewed. In all cases, there is a wide range of associated costs that vary depending on operating conditions and that affect which alternative is the most cost-effective.For an accurate assessment of the cost-effectiveness of a maintenance procedure, the initial direct cost of labor and materials cannot be considered in isolation. Previous research discussed life-cycle costing (LCC) for track maintenance and construction (2-6). However, initial and recurring direct costs of labor and materials are not the only costs that should be considered. In a practical working railroad environment, it is difficult to perform all required maintenance without delaying train operations. Transportation and engineering departments frequently compete for track time. Delay costs related to track maintenance may be incurred by trains using the line undergoing maintenance but may also affect other parts of the network. Traffic density on North American railroads is expected to increase, exacerbating the delay associated with maintenance (7). If the overall impacts and costs of maintenance-caused train delay are not fully accounted for, suboptimal decisions regarding infrastructure investment and maintenance strategies may result. Specific to the comparison of concrete and timber ties, a frequently cited economic analysis of North American crossties states that its analysis methods do not adequately account fo...

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Analyzing the transition from single- to double-track railway lines with nonlinear regression analysis

Cited by 14 publications

References 13 publications

Siding Spacing and the Incremental Capacity of the Transition From Single to Double Track

Siding Spacing and the Incremental Capacity of the Transition From Single to Double Track

Transportation Planning through GIS and Multicriteria Analysis: Case Study of Beijing and XiongAn

Cost and Delay of Railroad Timber and Concrete Crosstie Maintenance and Replacement

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