Development of rail transit network over multiple time periods

Hyperpaths enumeration is one of the basic procedures in many traffic planning issues. As a result of its distinctive structure, hyperpaths in Urban Rail Transit Network (URTN) are different from those in road network. Typically, one may never visit a station more than once and would never transfer from one line to another that has been visited in a loopless URTN, meaning that stations a hyperpath traversed cannot be repeated, neither do lines in loopless networks. This paper studies the relationships between feasible path and the shortest path in terms of travel costs. In this paper, a new definition of hyperpath in URTN is proposed and a new algorithm based on the breadth first searching (BFS) method is presented to enumerate the hyperpaths. The algorithm can safely avoid hyperpath omission and can even be applied in networks containing loops as well. The influence of parameters on hyperpaths is studied by experimentally finding hyperpaths in the subway network in Beijing. A group of suggested parameter pairs are then given. Finally, a numerical experiment is used to illustrate the validity of the proposed algorithm. The results imply the significance of the convergence of the BFS algorithm which can be used to search hyperpaths in large scale URTN even with loop.

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Perceived Trip Time Reliability and Its Cost in a Rail Transit Network

Sustainability ◽

10.3390/su13137504 ◽

2021 ◽

Vol 13 (13) ◽

pp. 7504

Author(s):

Jie Liu ◽

Paul Schonfeld ◽

Jinqu Chen ◽

Yong Yin ◽

Qiyuan Peng

Keyword(s):

Regression Models ◽

Influential Factors ◽

Rail Transit ◽

Linear Regression Models ◽

Transit Network ◽

Time Index ◽

Trip Time ◽

Buffer Time ◽

Transfer Times

Time reliability in a Rail Transit Network (RTN) is usually measured according to clock-based trip time, while the travel conditions such as travel comfort and convenience cannot be reflected by clock-based trip time. Here, the crowding level of trains, seat availability, and transfer times are considered to compute passengers’ Perceived Trip Time (PTT). Compared with the average PTT, the extra PTT needed for arriving reliably, which equals the 95th percentile PTT minus the average PTT, is converted into the monetary cost for estimating Perceived Time Reliability Cost (PTRC). The ratio of extra PTT needed for arriving reliably to the average PTT referring to the buffer time index is proposed to measure Perceived Time Reliability (PTR). To overcome the difficulty of obtaining passengers’ PTT who travel among rail transit modes, a Monte Carlo simulation is applied to generated passengers’ PTT for computing PTR and PTRC. A case study of Chengdu’s RTN shows that the proposed metrics and method measure the PTR and PTRC in an RTN effectively. PTTR, PTRC, and influential factors have significant linear relations among them, and the obtained linear regression models among them can guide passengers to travel reliably.

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Safety Assessment Method for Equipment of Urban Rail Transit Network Operation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.3958 ◽

2014 ◽

Vol 513-517 ◽

pp. 3958-3963 ◽

Cited By ~ 2

Author(s):

Bo Gao ◽

Ling Xi Zhu ◽

Xue Mei Xiao

Keyword(s):

Safety Assessment ◽

Spatial Information ◽

Urban Rail Transit ◽

Assessment Model ◽

Rail Transit ◽

Source Information ◽

Transit Network ◽

Urban Rail ◽

Network Operation ◽

Urban Rail Transit Network

Based on the multi-source information fusion and complex network theory, through studying the effective matching and integration of safety equipment and spatial information of urban rail transit network operation, a safety assessment model is proposed: through equipment fusion and the node fusion, the global safety parameter is obtained, which is accurate in description and evaluation of urban rail transit operating than the partial safety factors and realize the transform from microscopic description to macroscopic description.

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