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.
Road noise constitutes one of the most adverse impacts of road traffic on the environment. Noise that is particularly annoying for local inhabitants is recorded in the vicinity of engineering structures where various types of expansion joints are used [1–3]. There are currently many road connections being built in Poland, including a total of almost ten thousand expansion joints. The authors of this article attempt to determine the noise differences of several of the most commonly used expansion joints – single-, double-, and multi-module, block and finger expansion joint described as one of the most advantageous from the acoustic point of view. This study also attempts to determine the im-pact of expansion joint types on the noise level in comparison to the road section not equipped with these devices, which was adopted as the base noise level.