edition. Butterworth-Heinemann, 2011. 16. Stapelberg R. F.: Handbook of reliability, availability, maintainability and safety in engineering design. Springer Science & Business Media, 2009. 17. Szkoda M., Kaczor G.: RAMS analysis of railwayvehicles' lifecycle. Journal of KONBiN, vol. 41, 2017. 18. Szkoda M.: Kształtowanie potencjału przewozowego przedsiębiorstw transportu kolejowego. Monografia. Wydawnictwo Politechniki Krakowskiej, Kraków 2017, ISBN: 978-83-7242-925-4. 19. Szkoda M., Satora M.: Change in the maintenance strategy as a method of improving the efficiency
The article refers to the importance of the aspect of durability and reliability of wheelsets. It contains a short analysis of railway accidents in which the causes were failures of wheelsets. The paper lists most common faults occurring in the course of the wheelsets operation. The major problem of the paper were laboratory analyses of fretting wear developing in interference joints. The research has been conducted using a wheelset comprising a shaft and a sleeve. Fatigue tests in conditions close to the wheelset operating environment have been conducted. The laboratory analyses included macroscopic observation that indicated fretting wear signs on both sides of the wheel seat in form of a 3.5 mm wide ring around the entire perimeter. The following procedures included microscopic observations in the wear signs area, that indicated numerous material accumulations exposed to plastic deformation and oxidation.
-45.  Lack, T. & Gerlici. J. (2009). Railway wheel and rail roughness analysis. Komunikacie 11(2), 41-48.  Smetanka, L. & Šťastniak, P. (2017). Analysis of contact stresses of theoretical and worn profile by using computer simulation. Manufacturing Technology 17(4), 580-585.  Smetanka, L., Šťastniak, P. Harušinec, J. (2018). Wear research of railway wheelset profile by using computer simulation. MATEC Web of Conferences 157. DOI: 10.1051/matecconf/201815703017.  Loulová, M., Suchánek, A., Harušinec, J. & Strážovec, P. (2018). Analysis of a railwayvehicle
strategy research on a hybrid power system by hardware-in-loop experiments, Applied Energy 112: 1311-1317. Herb, F. (2010). Alterungsmechanismen in Lithium-Ionen-Batterien und PEM-Brennstoffzellen und deren Einfluss auf die Eigenschaften von daraus bestehenden Hybrid-Systemen, PhD thesis, University of Ulm, Ulm. Hillmansen, S. and Roberts, C. (2007). Energy storage devices in hybrid railwayvehicles: A kinematic analysis, Proceedings of the Institution of Mechanical Engineers: Journal of Automobile Engineering 221(1):135-140. Hillmansen, S., Roberts, C. and McGordon, A
Safe and economical devices, which are constantly growing in demand, lead to improvement of operational strategies applied in railway enterprises. Economic analysis and safety, and hence reliability and readiness, are the most important parameters in the operation of railway vehicles. The article presents a strategy for maintaining railway vehicles based on reliability indicators. The strategy was verified based on empirical research in a transport company.
This paper presents the application of failure mode and effects analysis (FMEA) for the risk assessment of changes in the maintenance system of railway vehicles based on the example of the 6Dg type shunting locomotive. The application example is preceded with an introduction to the methodological basis of FMEA, which is specified in literature and standards. In order to ensure the comparability of the analysis results with vehicles of a similar type and to quantify the risk components (the probability of hazard occurrence, the consequences of the occurrence of a hazard and the possibilities of hazard detection) the classification which applies to shunting locomotives was used. Based on the conducted analysis, the possibility to make changes to the maintenance plan for 6Dg locomotives which would not be in breach of the acceptable safety level was demonstrated and preventive safety measures were determined.
Railway transport is considered the most environmentally friendly. However, taking into account all factors, (including point pollution associated with the production of energy necessary for the movement of electric traction vehicles); this position is attractive, but a little less. Therefore, it is necessary to ensure that the amount of energy produced for railway transport is sufficient, but the lowest as possible. Creating new systems whose components for correct operation require a supply of electricity, they should be designed in such a way as to consume as little energy but meeting a series of standards. The aim of the article is to review selected requirements for the power supply of a railway vehicle equipped with automatic train control devices and identification of energy demand in the scope of supplying the rmCBTC on-board system, which is being developed by Rail-Mil Computers Company from Warsaw and the Faculty of Transport of the Warsaw University of Technology. The article presents an analysis of formal and legal requirements in the field of traction vehicles. Reference was made to the list of the Office of Rail Transport and the standards not included in it − PN-EN 50155, PN-EN 61000-6 and PN-EN 50125-2. Energy requirements in the field of traction vehicles equipped with an automatic train control system have been identified − e.g. voltage range of the onboard system, permissible decays, voltage dips, disturbances and environmental requirements. The energy requirements for the rmCBTC on-board system were also identified.
The first official document concerning technical risk assessment in railway transport was "Safety Directive" #49 released in 2004 by European Commission. It was particularized in commission regulation number 352 from 2009 on the adoption of a common safety method on risk evaluation and assessment. The actual requirement of technical risk assessment results from building and implementing IRIS, and from 2012 it will result from certification of maintenance facilities (Directive 110/2008/EC). In this article legal basics concerning technical risk assessment, and analysis of railway accidents were discussed.
The presented paper investigates the issues concerned with the RAMS analysis with the reference to the railway means of transport. The RAMS analysis includes the quantitative and qualitative indicators of degree, that the system and its components will meet all the assumed functions preserving the requirements of the availability and safety. RAMS is a long-term process, resulted from the applied tools and techniques throughout the life cycle of railway means of transport. The overall guidelines related to the development of RAMS features are included in PN-EN 50126 Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS).
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