This study investigated railway line planning optimization models that determine the frequency of trains on each line to satisfy passenger origin-destination demands while minimizing related costs. Most line planning models assume that all trains on the same route run with the same halting pattern. However, to minimize passenger travel time and to provide a train service with faster travel times to as many stations as possible, * This paper is a revised and expanded version of our article entitled "On the railway line planning model considering various halting patterns", in we must consider various halting patterns; these patterns can be provided in advance or are required to be formulated. Our study addresses two line planning problems that consider halting patterns, describes the computational complexities of each problem, and presents the column generation approach for one model. We also present experimental results obtained for the Korean high-speed railway network.
Many urban railways operate a single type normal train without combination with an express train on a line, particularly in Korea. As a result, the average speed of Korean urban trains becomes much slower than those of advanced railways. This paper is one result of Korean research into improving the low speed on urban railways. This paper presents two case studies of retrofitting urban railway infrastructure for a skip-stop operation; SMRT (Seoul Metropolitan Rapid Transit Co.) and KORAIL (Korea Railroad) lines. The first case takes an approach of minimum investment, and the second case tolerates the required investment for retrofitting infrastructure. Moreover, it presents several issues for retrofitting the existing infrastructure to make the line enable skip-stop operation. The first is to utilize existing staying sidings for overnight trains in the skip-stop operation. Second is skip-stop scheduling which consists of designing the stop-pattern of express trains and a trade-off between headway versus travel time. Last is a safety issue in the engineering work of an in-operating line and signalling system.
The development of tilting trains in Korea started in 2001 as a research and development project. A 6-car prototype test tilting train, called the Tilting Train eXpress (TTX), was built in December 2006 and experimental trials began in 2007. TTX has distributed power, is designed to run at 200 km/h, and has a planned service speed of 180 km/h. In this paper, the running time and time saving of the tilting train was evaluated compared with today's conventional diesel multiple unit (DMU) trains and non-tilting electric multiple unit (EMU) trains, based on the Gyeongbu line, which was the candidate for the tilting train operation between Seoul and Busan (441.7km). We evaluated the potential of a speed-up of tilting trains on curves, on the basis of the trial run data of the tilting train on the Gyeongbu line and present the tilting train's competitiveness in terms of travel time and speed. We also analyzed dynamic running stability and riding comfort of tilting control through the trial run train. We found a significant reduction of the journey times compared with today's conventional trains. Approximately 11% reduction is expected on the Gyeongbu line.
In our study, we present a new LOGIT-based traffic assignment model applicable to intercity railway network.Most traffic assignment models have been developed for public transit assignment in urban area, so that they are known to produce unrealistic results in intercity railway demand analysis. Especially, since the introduction of KTX, more passengers are using a route including KTX service and the schedule becomes more compatible with transfer. Our study presents a new LOGIT-based traffic assignment model considering passenger transfer. To do so, we suggest a new route search algorithm to find K paths with non increasing order in the utility value.
This paper addresses recent restoration of skip-stop operation in the Korean urban railway. Most urban railways in Korea were constructed without consideration of skip-stop operation as many other foreign urban railways. The Korean government had been requested to improve service quality, especially in operational speed, and it announced a policy to restore skip-stop operation for the urban railway lines. This paper presents roles of a central government for restoration of skip-stop operation. Besides leading by research and development side in technical solutions, the roles of the government are very important to implement the restoration. As examples of government's roles, this paper addresses Korean government's recent policy to restore the skip-stop operations.
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