Passenger train scheduling on a single-track or partially double-track railway with stochastic information

2010 ◽  
Vol 42 (11) ◽  
pp. 1003-1022 ◽  
Author(s):  
Lixing Yang ◽  
Ziyou Gao ◽  
Keping Li
Keyword(s):  
Single Track ◽  
Train Scheduling ◽  
Passenger Train ◽  
Double Track

scholarly journals Operational criteria in the justification of electrification of railway lines

2018 ◽  
Vol 180 ◽  
pp. 06005
Author(s):  
Andrzej Massel
Keyword(s):  
Rolling Stock ◽  
The Political ◽  
Economic Factors ◽  
Single Track ◽  
Railway Network ◽  
Railway Line ◽  
Passenger Traffic ◽  
Post War ◽  
Operational Criteria ◽  
Double Track

The process of electrification of the Polish railways took place from 1936 till early 1990s. Despite the political constraints of the post-war times, the decisions on electrification of particular sections of the railway network were usually based on economic factors. In 1970s and 1980s so called electrification thresholds were used to justify the need for electrification of railway line in question. They took into the number of tracks (single-track lines, double-track lines), terrain conditions (flat terrain, upland terrain) and the traffic structure (the share of passenger traffic) into account. In the framework of National Railway Program till 2023 (KPK) the realization of electrification projects have been undertaken again. The present paper deals with importance of the operational criteria in the decision-making concerning justification of electrification of railway lines. These criteria include the shortening of the journey times on particular sections, shortening of stops on the stations with the change of the type of traction, the savings of train operating companies resulting from the traction unification (change of demand for rolling stock and for workshops for its servicing), improvement of reliability and punctuality of services.

Improving Railway Operational Efficiency with Moving Blocks, Train Fleeting, and Alternative Single-Track Configurations

2020 ◽  
Vol 2674 (2) ◽  
pp. 146-157 ◽  
Author(s):  
Adrian Diaz de Rivera ◽  
C. Tyler Dick ◽  
Leonel E. Evans
Keyword(s):  
Heterogeneous Traffic ◽  
Capital Investments ◽  
Single Track ◽  
Delay Performance ◽  
Train Control ◽  
Schedule Flexibility ◽  
Financial Consequences ◽  
Operating Strategies ◽  
Traffic Composition ◽  
Double Track

With installation of positive train control (PTC) on many U.S. rail corridors, Class I railroads may soon leverage these investments in communications network infrastructure to implement “advanced PTC” systems incorporating moving blocks. Train control with moving blocks can benefit operating strategies that dispatch fleets of multiple trains running at minimum headways. On single-track corridors with passing sidings long enough to hold multiple trains, fleeting may increase the efficiency of train meets, reduce train delay, and yield incremental capacity benefits. Alternative single-track configurations with fleet-length sidings at double the spacing of conventional single-train sidings can facilitate these operating strategies while minimizing additional track infrastructure and associated capital and maintenance costs. To investigate the operational synergies between moving blocks, fleeting, and longer but less frequent sidings, Rail Traffic Controller software is used to simulate and compare the delay performance of train operations on representative rail corridors for different combinations of fleeting strategy, train control system, siding configuration, and freight traffic composition. Operating fleets in conjunction with moving blocks produces the lowest overall train delay in specific cases of low schedule flexibility and heterogeneous traffic. With more efficient meets, moving blocks and/or fleeting primarily benefit low priority trains that typically wait for opposing traffic during train meets. Such incremental line capacity benefits have short-term financial consequences as they allow additional capital investments in double track to be deferred. Knowledge of train delay performance under moving blocks and fleeting will aid railway practitioners evaluating investments in advanced PTC systems and track infrastructure expansion.

An Enhanced Optimization Model for Scheduling Freight Trains

2013 ◽  
Author(s):  
Brigitte Jaumard ◽  
Thai Hoa Le ◽  
Huaining Tian ◽  
Ali Akgunduz ◽  
Peter Finnie
Keyword(s):  
Optimization Model ◽  
Mathematical Program ◽  
Optimal Solution ◽  
Numerical Results ◽  
Optimization Models ◽  
Train Scheduling ◽  
Management Algorithm ◽  
Solution Scheme ◽  
Railway System ◽  
Double Track

We propose a new dynamic row/column management algorithm for the schedule of freight trains in a single/double track railway system. While many works have already been devoted to train scheduling, previously published optimization models all suffer from scalability issues. Moreover, very few of them consider the number of alternate tracks in the sidings for train meets, as well as the delay incurred by trains that take sidings. We propose a non time-indexed model, which takes into account such constraints, and we design a solution scheme with iterative additions/removals of constraints/variables in order to remain with a manageable sized mathematical program, while still ensuring convergence to an optimal solution. Numerical results are presented on data instances of Canada Pacific Railway. We evaluate the performance of the optimization model, and the sensitivity of the train schedules to the length of the operation hours, the length of the trains, and the departure times.

scholarly journals Influence of mounting joints of sections of a collapsible bridge on his stress-strain state

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Sergey Tomilov
Keyword(s):  
Carrying Capacity ◽  
Design Feature ◽  
Single Track ◽  
Technical Parameters ◽  
Emergency Situations ◽  
Operational Characteristics ◽  
Bridge Structures ◽  
Bridge Building ◽  
Double Track ◽  
The Military

Temporary bridges are necessary to ensure movement during the construction or repair (reconstruction) of capital bridge structures, operational communication of interrupted tracks in various emergency situations, for one-time or seasonal transport communications. For this purpose, reusable mobile prefabricated structures are advisable. Inventory sets of collapsible bridges were designed and manufactured primarily in the interests of the military department, but are currently widely in demand and are used in the civilian sector of bridge building because of their economy, mobility, and accessibility in transportation. Among others, including modern collapsible bridge designs, the middle automobile collapsible bridge (CAPM), developed in 1968 and modernized in 1982 for the needs of the USSR Ministry of Defense, occupies a special place. In the process of withdrawing the CAPM sets stored in storage to the civilian construction sector, a significant demand for these structures was found to be due to their following advantages: complete staffing with all elements of the bridge, including supports; the possibility of overlapping spans of 18.6, 25.6, 32.6 m with the dimensions of the driving bed 4.2 m for single-track and 7.2 m for double-track passage Passport carrying capacity is designated as 40 tons for single-track passage and 60 tons for double-track passage. Since, according to a number of geometric and technical parameters, CAPM designs do not fully comply with the requirements of modern standards for capital bridges, their application is mainly oriented as temporary. It should be noted that with minor refinement – the installation of modern fences and a double-track transverse arrangement of sections for single-lane traffic, it is possible to achieve compliance with the required geometric parameters of the driving bed and the total lifting capacity for bridges on public roads of IV and V of technical category. The article considers the design feature of the pin mounting joints of sections of a collapsible span as a factor determining the carrying capacity, the nature of general deformations and, as a result, affecting the transport and operational characteristics of the bridge structure. The purpose of this study is to analyze the operation of the pin mounting joints of the sections of the spans of the CAPM with the assessment of the stress state of the elements of the connection node. We consider the novelty in the consideration of the issue to be an assessment of the strength of the elements of the pin joints and its effect on the general deformations – the deflections of the main beams.

scholarly journals Przydatność kryteriów litogenetycznych w konstrukcji numerycznego modelu krążenia wód podziemnych w strefie krawędziowej wysoczyzny

2017 ◽  
Vol 26 (4) ◽  
pp. 514-527
Author(s):  
Tomasz Falkowski ◽  
Filip Bujakowski ◽  
Piotr Ostrowski ◽  
Grzegorz Wierzbicki
Keyword(s):  
Single Track ◽  
Equipment Repair ◽  
Arable Soils ◽  
Line Section ◽  
External Sources ◽  
Potential Pollution ◽  
Double Track ◽  
Copper Lead ◽  
Shunting Yard

The aim of the study was to assess the quality of soils underneath operating railway lines. The lines selected for the examination were outside the reach of external sources of potential pollution. The samples were collected along a plain line section after and before an upgrade work, within the station area and in a railway equipment repair yard. The assessment covered the following types of sections: single-track, double-track, with wooden and concrete sleepers, adjacent to switches subject to lubrication, in the car shunting yard and visibly contaminated areas. The samples were tested for the content of PAH, zinc, copper, lead and PCB. The study did not find evidence of increased levels of the above-listed compounds as compared to the levels found in arable soils located in the vicinity of the line or of their influence on adjacent lands. The content of the examined compounds did not differ depending on the type of line section or its properties. The content of PAH, considered one of the main railway-related pollutants, was sufficiently low to classify the soil along the line and within the station area as unpolluted or slightly polluted.

scholarly journals Railway Planning Double-Double Track (Case Study of Bekasi Station km 26 + 652 - Jatinegara Station km 12 + 050

2020 ◽  
Vol 4 (1) ◽  
pp. 12-21
Author(s):  
Ido Prasetio ◽  
Andri Irfan Rifai
Keyword(s):  
Human Error ◽  
Urban Land Use ◽  
Single Track ◽  
Train Track ◽  
Railway Line ◽  
Railway Planning ◽  
Physical Changes ◽  
Double Track ◽  
The Impact

Increasing the number of population and the development of activities will cause a growing need for space every day, this will result in physical changes and urban land use and can cause increased intensity of population movement from Megapolitan cities such as Bekasi, Bogor and Tangerang to the Metropolitan city (DKI Jakarta). Some people have now started to move from private vehicles to use public (mass) transportation such as buses, transjakarta, and electric rail trains or commonly known as KRL Commuter Line that serve Jabodetabek routes. The impact of crossing also causes buildup at each station. Train track with a single track (single track) is considered ineffective and inefficient and vulnerable to train accidents due to human error. It is necessary to develop or develop a double track to become a double-double track Bekasi Station km 26 + 652 - Jatinegara Station km 12 + 050. The research location is on the railway line from Bekasi Station to Jatinegara Station. The length of the train track is around 16 km and has 7 stations that are traversed, 5 of which are active (stop) and 2 passive stations.

scholarly journals Alternate Double Single Track Lines

2016 ◽  
Author(s):  
Zacarias Grande Andrade ◽  
Paola Moraga Contreras ◽  
Enrique Castillo Ron
Keyword(s):  
Travel Time ◽  
High Speed ◽  
Time Increase ◽  
Single Track ◽  
Maintenance Costs ◽  
Railway Infrastructure ◽  
Double Track

The paper discusses the advantages and shortcomings of alternate double single track (ADST) lines with respect to double track lines for high speed lines. ADST lines consists of sequences of double and single track segments optimally selected in order to reduce the construction and maintenance costs of railway lines and to optimize the timetables used to satisfy a given demand. The single tracks are selected to coincide with expensive segments (tunnels and viaducts) and the double tracks are chosen to coincide with flat areas and only where they are necessary. At the same time, departure times are adjusted for trains to cross at the cheap double track segments. This alternative can be used for new lines and also for existing conventional lines where some new tracks are to be constructed to reduce travel time (increase speed). The ADST proposal is illustrated with some examples of both types (new lines and where conventional lines exist), including the Palencia-Santander, the Santiago-Valparaíso-Viña del Mar and the Dublin-Belfast lines, where very important reductions (90 %) are obtained, especially where a railway infrastructure already exist.DOI: http://dx.doi.org/10.4995/CIT2016.2016.3426

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