Abstract: Skewed loading will aggravate railway wagon’s dynamic properties to result in an increasing of the dynamic loads and decreasing of lives in service of the parts and components subject to vehicle’s kinetics. New concise dynamic models are constructed in sequent for the wagon and then for wheelsets with skewed loading under consideration of vehicle inertia and detailed transferring forces, referred to the existent codes EN 13103/EN 13104/JIS E 4501. Method is then established for determining loads of vehicle related kinetic parts and components including the journal bearings. Estimation methods for the loads and probabilistic live of the bearings is proposed on referring to the loading and probabilistic life L10 theory in the code ISO 281. An assessment practice is performed for the journal bearings of a freight car with 37.5 t axle weigh incorporated skewed loading cases. Results show a non-linear increasing effect on the spectral equivalent radial loads and a non-linear decreasing effect on the probabilistic lives of the bearings. Critical criteria of lateral 15 mm and longitudinal 30 mm should be controlled to keep the decreasing rate of life in a range of 30 percent.

Key words: bearing, probabilistic life, railway wagon, skewed loading