Subway lines are responsible for 20% of the total passenger traffic in Tehran. Particulate matter is one most important major pollutants subway stations and increasing their concentration leads to numerous health consequences passengers employees. This study aims investigate PM10 PM2.5 four underground metro compare them with these particles open air. Seasonal sampling (April 2018 - April 2019)...

Energy consumption for multiple trains on the urban subway line is predominantly affected by the operation strategy. This paper proposed an energy-saving operation strategy for multiple trains, which is suitable for various line conditions and complex train schedules. The model and operation modes of the strategy are illustrated in detail, aiming to take full use of regenerative braking energy ...

The New York City Transit Authority has included formal proofs at system level as part of the safety assessment for its New York subway Line 7 modernization project, based on the CBTC from Thales Toronto. ClearSy carries out these proofs. In this paper, we describe the expected results and benefits of such proofs. We also discuss the methodology, in particular the importance of obtaining a natu...

Efficiency evaluation is one of the major issues in urban transportation. Since the efficiency of the systems is affected by its data and output, what makes the results of the performance evaluation valid and applicable, is selecting the appropriate data and outputs of the system. In this study, the efficiency of the subway stations in Tehran in case of return, compared to the fixed scale, is m...

Subways have been an important method for relieving traffic pressures in urban areas, but ground subsidence, during construction and operation, can be a serious problem as it may affect the safety of its operation and that of the surrounding buildings. Thus, conducting long-term ground deformation monitoring and modeling for subway networks are essential. Compared with traditional geodetic meth...

Some incidents in urban railway systems affect the function of the subway’s company adversely and they could disorder the services. These events may inflict irreparable damage to passengers, employees and equipment. By recognizing the hazards existing in this type of transportation system and evaluating and prioritizing risks, we can perform appropriate actions to reduce the probability and sev...

We consider a combinatorial problem motivated by a special simplified timetabling problem for subway networks. Mathematically the problem is to find (pairwise) disjoint congruence classes modulo certain given integers; each such class corresponds to the arrival times of a subway line of a given frequency. For a large class of instances we characterize when such disjoint congruence classes exist...

1- introduction transportation and traffic is one of the major issues and challenges that are facing urban managers. so that it has become one of the major challenges in the political area. transport is one of the most important elements of urban development which is used for people and goods moving from a different geographical place to other places. in order to achieve efficient productive in...

Based on our experience in the development of an interactive system for the control of subway lines, we set forward some notions about various forms of context and about context sharing. In effect, context plays a crucial role especially for incident solving on a subway line. The analysis of operators' behavior doing incident solving proved that context takes three different forms, namely exter...