scholarly journals Railway Capacity Enhancement with Modern Signalling Systems – A Literature Review

2021 ◽  
Vol 33 (1) ◽  
pp. 141-152
Author(s):  
Matea Mikulčić ◽  
Tomislav Josip Mlinarić
Keyword(s):  
Scientific Literature ◽  
Investment Planning ◽  
Continuous Increase ◽  
Customer Expectations ◽  
Capacity Enhancement ◽  
Train Control ◽  
Railway Infrastructure ◽  
Railway Capacity ◽  
Signalling Systems ◽  
Capacity Determination

In times of ever stronger awareness of environmental protection and potentiation of a beneficial modal split, the railway sector with efficient asset utilization and proper investment planning has the highest chance of meeting customer expectations and attracting new users more effectively. Continuous increase in railway demand leads to an increase in the utilization of railway infrastructure, and the inevitable lack of capacity, a burning problem that many national railways are continually facing. To address it more effectively, this paper reviews available methodologies for railway capacity determination and techniques for its enhancement in the recent scientific literature. Particular focus is given to the possibility of increasing railway capacity through signalling systems and installing the European Train Control System (ETCS). The most important relationships with segments of existing research have been identified, and in line with this, the directions for a potential continuation of research are suggested.

scholarly journals A CASE STUDY OF THE IRANIAN NATIONAL RAILWAY AND ITS ABSOLUTE CAPACITY EXPANSION USING ANALYTICAL MODELS

Transport ◽  
2015 ◽  
Vol 32 (4) ◽  
pp. 398-414 ◽  
Author(s):  
Bayan Bevrani ◽  
Robert L. Burdett ◽  
Prasad K. D. V Yarlagadda
Keyword(s):  
Sensitivity Analysis ◽  
Traffic Flow ◽  
Upper Bounds ◽  
Analytical Models ◽  
Optimization Approach ◽  
Lower And Upper Bounds ◽  
Train Services ◽  
Railway Capacity ◽  
Capacity Determination

Identifying railway capacity is an important task that can identify ‘in principal’ whether the network can handle an intended traffic flow, and whether there is any free capacity left for additional train services. Capacity determination techniques can also be used to identify how best to improve an existing network, and at least cost. In this article, an optimization approach has been applied to a case study of the Iran national railway, in order to identify its current capacity and to optimally expand it given a variety of technical conditions. This railway is very important in Iran and will be upgraded extensively in the coming years. Hence, the conclusions in this article may help in that endeavor. A sensitivity analysis is recommended to evaluate a wider range of possible scenarios. Hence, more useful lower and upper bounds can be provided for the performance of the system.

scholarly journals Rational distribution of the high-speed railway capacity between trains of various categories

2018 ◽  
Vol 76 ◽  
pp. 95-100
Author(s):  
Viktor Myronenko ◽  
Viacheslav Matsiuk
Keyword(s):  
High Speed ◽  
Equal Access ◽  
High Speed Railway ◽  
Passenger Transportation ◽  
Rational Distribution ◽  
Railway Infrastructure ◽  
Railway Capacity

The article presents a methodology for the distribution of available capacity of high-speed railways, in the conditions of equal access to the railway infrastructure of different participants of the transport market. This will allow maximizing the efficiency of using available capacity of high-speed railways, while simultaneously organizing freight and passenger transportation.

scholarly journals A NEW APPROACH TO ESTIMATING THE OCCUPATION TIME OF THE RAILWAY INFRASTRUCTURE

Transport ◽  
2010 ◽  
Vol 25 (4) ◽  
pp. 387-393 ◽  
Author(s):  
Jozef Gašparík ◽  
Vladislav Zitrický
Keyword(s):  
Conceptual Framework ◽  
Occupation Time ◽  
New Approach ◽  
Railway Infrastructure ◽  
Railway Capacity ◽  
Track Line

The paper describes UIC methodology and a technique used by Slovakian infrastructure managers for estimating railway capacity and proposes a new approach to evaluating the capacity consumption of a track line (occupation time) based on the graphic approach. The new methodology concerns for the assessment of infrastructure occupation time and is a conceptual framework developed by the authors for an easier evaluation of occupation time in the train traffic diagram.

scholarly journals Calculation Model of Railway Capacity Price in the Czech Republic

2021 ◽  
Vol 33 (1) ◽  
pp. 91-102
Author(s):  
Jaromír Široký ◽  
Petr Nachtigall ◽  
Jozef Gašparík ◽  
Jiří Čáp
Keyword(s):  
Ad Hoc ◽  
Capacity Allocation ◽  
Calculation Model ◽  
Operational Conditions ◽  
Railway Infrastructure ◽  
Proposed Model ◽  
Railway Capacity ◽  
The Individual ◽  
Annual Working ◽  
The Cost

This paper presents a pricing model of railway infrastructure capacity allocation functioning as a regulatory measure while fulfilling the regulatory requirements on railway infrastructure capacity allocation. The prices of railway infrastructure capacity allocation will be modelled with regard to all economically justifiable costs of railway infrastructure capacity allocation. The structure of model has been developed as a set of calculation sheets in Microsoft Excel. The recommended prices for railway capacity have been found by simulation of a set of variants and the recommendation is done for different operational conditions in an individual way. It analyses different products offered by the railway infrastructure capacity allocator both in the annual working timetable mode, and in the individual ad hoc mode. The aim of the proposed model is to motivate not only railway undertakings, but also the railway infrastructure capacity allocator to submit requests for railway infrastructure capacity in the annual working timetable mode rather than in the individual ad hoc mode. The total price is then verified to the cost of railway infrastructure capacity allocation. This process then ensures the regulation of the demand of railway undertakings on the given route and can influence the decision about the use of the product offered.

Impact of Electromagnetic Environment on Reliability Assessment for Railway Signalling Systems

2012 ◽  
pp. 151-173 ◽  
Author(s):  
Iñigo Adin ◽  
Jaizki Mendizabal ◽  
Jon del Portillo
Keyword(s):  
Reliability Assessment ◽  
Rolling Stock ◽  
Noise Environment ◽  
Communication Signal ◽  
Railway Infrastructure ◽  
Railway Industry ◽  
Railway System ◽  
Railway Signalling ◽  
The Relationship ◽  
Signalling Systems

The electromagnetic interferences (EMI) are threats that affect the reliability of the railway signalling systems. Consequently, the identification of the reliability requirements dependent on environment conditions is a major issue for signalling systems designers, and therefore for evaluators, and testing and certification bodies. Signalling systems work in the complex and heterogeneous railway environment, where low power electronics have to work together with high voltages and currents from trains and railway infrastructure. This chapter presents the relationship between the railway electromagnetic interoperability and the reliability assessment by analyzing the signalling systems and the associated inter-dependencies with other components of the rolling stock. It is composed of two main sections; the first gathers an exhaustive state of the art approach to the issue of electromagnetic interoperability and railway industry. This subsection steers towards the combination of electromagnetic interferences and the signalling systems present in the rolling stock noise environment. That is the basis of the second section that finally sets how to establish the reliability requirement for a communication path in this environment. This requirement is established because of the electromagnetic noise environment, as well as the radiated and conducted fields, which are a combination of all the surrounding threats a focused railway system has to face. It also depends on the modulation of the communication signal under study.

scholarly journals Trends and gaps in the global scientific literature about Jatropha curcas L. (Euphorbiaceae), a tropical plant of economic importance

2018 ◽  
Vol 39 (1) ◽  
pp. 7 ◽  
Author(s):  
Illana Reis Pereira ◽  
Patrícia Lima D'Abadia ◽  
Angélica Daiane Lemos do Prado ◽  
Fabio Santos Matos ◽  
João Carlos Nabout ◽  
...  
Keyword(s):  
International Collaboration ◽  
Jatropha Curcas ◽  
Scientific Literature ◽  
Scientific Production ◽  
Biofuel Production ◽  
Natural Fertility ◽  
Scientometric Analysis ◽  
Physic Nut ◽  
Continuous Increase ◽  
Jatropha Curcas L

Jatropha curcas L., popularly known as the physic nut, is a monoecious, perennial lactiferous species belonging to the family Euphorbiaceae. Recently, interest in this species has been growing, due to its ability to flourish on degraded land and in soils with low natural fertility, the high oil content of its seeds, its rapid growth and easy propagation, and the identification of several secondary metabolites with medicinal importance. This study aims to report the main trends and gaps in the global scientific literature about J. curcas L, using a scientometric analysis. We have carried out this scientometric analysis on the global literature to identify: 1) temporal publication trends; 2) the quality of scientific production, estimated using citation numbers and journal impact factors; 3) the main journals and countries interested in this topic and the language of scientific divulgation; 4) the main research fields; 5) the use of wild or commercial cultivars; and 6) average authorship levels and international collaboration networks. Our findings have revealed a continuous increase in both quantitative and qualitative parameters in studies about J. curcas. The main trends in physic nut studies involve biofuel production and the plant’s agronomic characteristics. The main knowledge gaps relating to J. curcas are in the fields of forestry, sustainability, animal nutrition, and genetic improvement. Another problem identified in this study is a lack of commercial seeds; none of the studies analyzed have used commercial seeds. India, Brazil, and China together are responsible for 55% of the knowledge about this species, obtained through scientific production. Only moderate international collaboration has been observed between countries, perhaps as consequence of conflicts of interest. Despite an increasing number of articles, some countries have stopped producing J. curcas L, and the worldwide crop production has decreased.

scholarly journals Operationalizing Water Security Concept in Water Investment Planning: Case Study of São Francisco River Basin

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3658
Author(s):  
Alexandre Lima de F. Teixeira ◽  
Anik Bhaduri ◽  
Stuart E. Bunn ◽  
Sérgio R. Ayrimoraes
Keyword(s):  
River Basin ◽  
Green Infrastructure ◽  
Water Security ◽  
Environmental Water ◽  
Security Threats ◽  
Investment Planning ◽  
Security Risks ◽  
Continuous Increase ◽  
Sao Francisco River ◽  
São Francisco River

Despite advances in water resources management and planning, the São Francisco River Basin in Brazil has suffered from systematic drought problems in recent years, leading to severe human and environmental water security threats. This paper aims to track the water security for different periods and its relations with the changes in physical and natural asset conditions. The paper explores how investment planning to mitigate the water security threats and explore opportunities to increase the value of investments. The paper finds that grey infrastructure has regulated threats from increasing in the downstream of the river basin, however, continuous increase in water security threats in the upstream of the basin threatens water security downstream. This is evident from the spatial connectivity and unidirection externalities. As the capacity to further increase in grey investment is reaching its limit in the downstream, the increases in green infrastructure investment upstream, especially in the Grande River basin, could be one the way to reduce the externalities and minimise the water security risks.

Sign in / Sign up

Export Citation Format

Share Document