Influence of train wheel load and arising support imperfections of railway jointless track on its work during operating

In the paper an analyses of chosen problems of influence of train wheel load and arising imperfections in jointless track on its work during operating are presented. A typical classification of arising imperfections in railway track is shown (on the basis of publications analysis and author's personal researches and analyses). In the paper appearing changes of stiffness between varied constructions (e.g. track–bridge, track–railway crossing) which in literature is defined as threshold effect are presented. An example of analyses of induced and intended imperfection in railway track with field investigations results and author's theoretical calculations are given. It is stated, that special attention shall be paid to wheel flat place significance as the source of following track structure degradation „from the top” and additional force loading railway track. In the paper a negative effects of considerable change of contact and support with rail roadbed are described.