Abstract
The study reveals an influence of the main technological parameters on the probability of failing and uptime work to receive and dispatch transit cargo trains in time. The determined regularities concern failures resulting from changes in the daily load, the technological equipment of transit depots, and uneven sizes of arriving and departing flows of trains. The importance of the research is grounded on a lack of objective assessment of the reliability of a standard operational model of processes that take place at maintenance depots for railway transport, which means that it is essential to determine the probability of failure of timely receipt and dispatch of cargo trains. The level of failure and the trouble-free uptime are mainly affected by the size of the operational fleet of train locomotives, the uneven number of daily trains, and the minimal pre-set intervals of associated arrivals and departures of trains. The research has established that the existing standards ensure the required level of reliability (the probability of a timely acceptance of trains at 95 %). However, the time of trains’ staying on receiving and departure tracks exceeds the norm almost 4 times, which minimizes the likelihood of timely departures of trains. The probability of failure in timely departures is not taken into account by the current regulations; therefore, it is suggested that such a standard should be introduced. The undertaken tests facilitate objective evaluation of the reliability of the typical technological processes that take place at technical railway stations and entail the need to review the methods of its rationing.
Highlights
Meeting the deadlines of cargo delivery with a rational use of available production resources can be regarded as the main operational challenge of railways
The existing procedure for rationalizing the time of trains staying on the receiving and departure tracks should take into account the stochastic nature of the technological processes and the work volumes
The tests on the technological reliability of the operational process in the RTS were conducted with regard to the typical standards of technical stations and with the following findings: 1) the common features of technical systems’ dependability – the probability of failure and reliability – by their essence help assess the possibility for the RTS in its operational process to ensure timely acceptance and timely departure of trains
Summary
Meeting the deadlines of cargo delivery (subject to safety) with a rational use of available production resources can be regarded as the main operational challenge of railways. Technical regulation, production planning and the overall arrangement of a rail transit system (hereinafter, RTS) should ensure an appropriate level of reliability. In addition to purely technical and managerial (in terms of efficiency of decision-making by the personnel) components, the technological process itself, as a set of sequential queuing systems, must be reliable enough. A study of technological reliability – such as a study of the influence patterns of an existing set of parameters on the probability of failure and the average duration of trouble-free operational processes of train stations and other rail transport systems – are important scientific and applied problems
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