• Title/Summary/Keyword: 화물열차

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A Study on the Equalization of Pneumatic Brake-Release Performance between Various Freight Cars (이종(異種) 화물열차의 제동-완해 공기압성능 균등화에 관한 연구)

  • Nam, Seong-Won;Moon, Kyung-Ho;Lee, Dong-Hyung
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.525-532
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    • 2001
  • Experimental study has been conducted to clarify the pneumatic characteristics of brake system for freight train and enhance the performance of diaphragm valve. Empty-load and diaphragm brake systems are mainly used in the freight trains of KNR (Korean National Railroad). The train set is composed of thirty freight cars and diesel locomotive. From the experimental results, new quick release valve shortens release time after brake application. In case of normal brake application, the release time is short by 34% of that of original diaphragm control valve. It will be expected to assure brake-release application and reduce maintenance efforts.

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A Study of Dynamic Characteristic of the Leaf Spring for Freight Wagon After the Derailment (탈선 후 화물열차의 겹판스프링 동적특성 연구)

  • 이응신;이장무
    • Journal of the Korean Society for Railway
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    • v.7 no.1
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    • pp.49-54
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    • 2004
  • Particularly derailing freight wagon, which are loaded with dangerous chemicals, has large damages on humans and environment. In this paper the dynamic characteristic of the laminated leaf spring under extreme situation, for example derailment, is examined. The leaf spring has a static hysteresis. Not only the friction value, but also the spring rate are influenced by this hysteresis characteristic. Because of the static hysteresis of the leaf spring the spring rate must be used in normal operation depending upon the loading and the kind of the excitation with the up to 10-fold value of the static spring rate. Some characteristics of the leaf spring can be treated like well-known viscous damping, but fer special situation (preload and/or excitation) particular calculation are necessary.

Estimating Line Capacity Considering High-Speeding and Diversification of Trains (열차 속도향상과 다양화를 감안한 선로용량 산정에 관한 연구)

  • Ki, Hyung-Seo;Park, Dong-Joo;Choi, Jong-Bin;Choo, Jun-Sup
    • Journal of the Korean Society for Railway
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    • v.12 no.5
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    • pp.623-630
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    • 2009
  • The Korean railway system is a mass transit system consisting of a variety of train types such as common trains, high-speed train (KTX) and Metropolitan Express Railway (EMU). Its operation is based on the official timetable and it provides us with safe, accurate, quick and comfortable service. The objective of this study is to propose and prove more practical method for estimating line capacity by considering high-speeding and diversification of trains. In particular, the focus of this study is to reduce the discrepancy between the result of the theoretical line capacity estimation and the real line capacity of the operating agency of the Korean railway. In order to achieve the object, this study introduces a new railway capacity notion by considering TPS of line alignment, the operation type, train control and signaling system, etc. Through a practical schedule diagram exemplification, the result of the proposed method is verified as well.

Estimating Line Capacity Considering High-Speeding and Diversification of Trains (열차 속도향상과 다양화를 감안한 선로용량 산정에 관한 연구)

  • Ki, Hyung-Seo;Park, Dong-Joo
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.1839-1850
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    • 2009
  • The Korean railway system is a mass transit system in which a various types of trains such as common trains, high-speed train (KTX), Metropolitan Express Railway (EMU) are operated. It is operated based on a timetable and provides us with safety, regularity, quickness and comfortable service. The objective of this study is to propose a method for estimating line capacity considering high-speeding and diversification of trains. In particular, the focus of this study is on the closing gap between the result of the existing line capacity estimation method and the real-world line capacity of the operating agency of the Korean railway. For this, this study introduces a new railway capacity definition by considering TPS of line alignment according to the operation type, train control and signaling system, etc. The verification of the proposed method using a practical schedule diagram exemplification is discussed as well.

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Multimodal Route Selection from Korea to Europe Using Fuzzy AHP-TOPSIS Approaches: The Perspective of the China-Railway Express (한-유럽 복합운송 경로선택에 관한 연구 중국-유럽 화물열차를 중심으로)

  • Wang, Guan;Ahn, Seung-Bum
    • Journal of Korea Port Economic Association
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    • v.37 no.4
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    • pp.13-31
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    • 2021
  • Since the signing of the Korea-Europe Free Trade Agreement, the volume of trade transactions between South Korea and Europe has increased. The traditional single-mode transport system has been transformed into an intermodal transport system using two or more modes of transport. In addition, the conventional sea and air transport routes have been restricted, leading to a decline in Korean exports to Europe, and the rail transport mode is becoming mainstream in the market due to the influence of COVID-19. This paper focuses on the China-Railway Express to explore a new intermodal transport route from Korea to Europe. First, the fuzzy analytic hierarchy process (AHP) is used to evaluate the factor weights when selecting intermodal transport routes from Korea to Europe. Then, the TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution) method is used to rank three alternatives. The results show that among the four factors (total cost, total time, transportation capability, and service reliability), the total cost is the most significant factor, followed by the total time, service reliability, and transportation capability. Furthermore, the alternative route 1 (Incheon-Dalian-Manchuria-Hamburg) is preferred.

A Study on Time-Expanded Network Approach for Finding Maximal Capacity of Extra Freight on Railway Network (시간전개형 네트워크 접근법을 이용한 기존 열차시각표를 고려한 추가적 철도화물 최대수송량 결정에 관한 연구)

  • Ahn, Jae-Geun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.8
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    • pp.3706-3714
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    • 2011
  • This study deals with the algorithm to finding the maximum capacity and their schedule of extra freight while honoring planned timetable of trains on railway network. Time-expanded network, a kind of space-time graph, can be shown both planned train timetable and dynamic features of given problem. Pre-processing procedure is a series of infeasible arcs removal from time-expanded network honoring planned timetable. In the result, this preprocessing transforms dynamic features of given problem into static maximal flow problem which can be easily solved.

International Comparison of Railway Freight Performance (국가별 철도물류 운영현황 비교연구)

  • KIM, Young Joo;KWON, Yong Jang;HUR, Jun;CHUNG, Sung Bong
    • Journal of Korean Society of Transportation
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    • v.33 no.5
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    • pp.431-440
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    • 2015
  • This study aims to quantify the railway freight performance using various indicators, to compare it over many countries, and to evaluate efficiency of railway freight in Korea. The indicators developed in this study was classified into two categories; country-specific and company-specific indicator. The former includes freight train density, average gross train load and average haul while the latter contains revenue/ton-km, ratio of operating costs to revenue, revenue per employee, ton-km per employee, costs per ton-km and ratio of labor costs to total operating costs. The results of this study shows that Korail performance is in low efficiency due to multi-frequency small amounts transport. The productivity of railway freight in Korea represented as ton-km per employee appears to be lower than that of other oversea companies considered in this study.

A Study on the Fare Elasticities of DST Applications; An Empirical Analysis (경전선 이단적재열차(DST) 도입을 위한 운임 탄력성 조사 연구)

  • Yun, Donghee;Lee, Jinsun;Kim, Ickhee
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.517-523
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    • 2012
  • Double Stack Train(DST) is being used variously around USA and Canada. The greatest advantage of the DST is mass transportation without extending the length of freight train and number of cars. So the DST system can be a kind of innovative train to increase the competitiveness of rail logistic business. As the domestic rail logistic increase, for enhancement of environment friendly green transportation amount, the DST needs more for efficiency. In this study, as the alternative way to introduce the DST to the Kyungbu Line, it's investigated the extensibility of rail freight with the relation of rail fare discount and examined the necessity of pilot business to the Kyungjeon Line which was expected comparatively lower cost. If the DST system is introduced to the Kyungjeon Line, the cost of mass transportation can be much lower and then the comparativeness of rail transportation will be increased, therefore logistic companies can have some margin additionally. In the result of survey to the related companies, if rail transportation fare is 37.7 % cheaper than current road transportation fare, the modal shift can be transferred by maximum 100%.

An Optimization Model for Assignment of Freight Trains to Transshipment Tracks and Allocation of Containers to Freight Trains (화물열차 작업선배정 및 열차조성을 위한 수리모형 및 해법)

  • Kim, Kyung-Min;Kim, Dong-Hee;Park, Bum-Hwan
    • Journal of the Korean Society for Railway
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    • v.13 no.5
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    • pp.535-540
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    • 2010
  • We present an optimization model for how to assign the freight trains to transshipment tracks and allocate the containers to the freight trains in a rail container terminal. We formulate this problem as a multi-criteria integer programming to minimize the makespan of job schedule and simultaneously to maximize the loading throughput, i.e. the number of containers to be disposed per day. We also apply our model to the instance obtained from the real-world data of the Uiwang Inner Container Depot. From the experiments, we can see an improvement of approximately 6% in makespan, which means that our model can contribute to the improvement of the disposal capacity of containers without additional expansion of facilities.

A Study on the activate transport goods by the railroad through the analysis of Users selection of factors (철도화물 이용요인 분석을 통한 철도물류 활성화 방안에 관한 연구)

  • Cho, Sam-Hyun
    • Journal of Korea Port Economic Association
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    • v.25 no.2
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    • pp.247-258
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    • 2009
  • Rail transportation system are needed to develop proper corresponds to satisfy various demands in freight transportation since there are many problems in rail transportation infrastructure and operation. This paper analyzes characteristics of rail transportation consumers and develops policy for vitality of rail transportation by survey of rail transportation consumers and AHP methodology. This paper is organized as follows. Section 1 presents the description of the objective and the methods for this study. Section 2 presents the description of the methods for analysis of characteristics of consumers of rail freight transportation. Section 3 presents the characteristics of rail transportation consumers by analysis the survey results of rail transportation consumers. Section 4 summarizes our conclusions and discusses further research topics.

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