Tasks faced by the Russian economy highlight the need to find ways of enhancing operation efficiency developing railway transport. At the same time, we should not forget that railway transport, like any other complex system, faces uncertainty or risks while carrying out its activities. Uncontrollable risks can lead to unplanned maintenance costs, harm to people, property and other negative consequences that adversely affect the operating performance of JSC RZD.

The paper has investigated mathematical models of the reliability of LAN with an arbitrary topology and recoverable components, with the analysis allowing to obtain the ratios of probabilities of data loss in a network, a failure probability and expectation of time to failure of a network’s components, without any assumptions about the laws of distribution of random variables. It has also offered the model for accounting multiple failures of network components.

The paper offers two modifications of the nonparametric root estimation of a density function in case of incomplete data in the form of grouped frequencies of failures. The first (integrated) method is connected with respective alteration of a likelihood function. The second (resampling) method of the restoration of failures is based on the iterative restoration of failure time points. The accuracy of the offered estimation methods has been investigated.

The paper considers the analysis of reliability and adaptability of a microwave attenuator as exemplified by commercially available attenuators used in modern powerful wattmeters of absorbed type.

This paper has shown the topicality of using a method of expert judgments for developing complex technical systems (CTS). And in reference with this, the paper has considered the issues of judgments of a required number of experts in conducting peer reviews, their expert knowledge, data on the minimum size of an expert group and methodical approach to determine the level of possible errors of experts to provide judgment of an expert group, including expert assessments on the basis of past knowledge, as well as the possibility of an aggregate consideration of opinions of individual experts involved in the assessment of a case study.

The paper offers the method of optimal algorithms construction for fault finding in systems where losses from failures grow exponentially with recovery time increasing. Such a situation is typical for railway automation systems.

The paper describes the procedure for building business processes insuring the security of information system resources, which is the environment of an enterprise’s automated business processes operation and represented in the form of a reference model of an open environment.

The probability of a transport accident significantly depends on various factors and groups of factors. The paper investigates the economic expedience of monitoring a random factor and transport accident prevention. Several criteria for utility evaluation of monitoring and prevention for various strategies to minimize an accident risk are offered. The paper also presents an example of using these results in a train makeup.