Thermal and misalignment effects on the operation of railroad bearing are examined. In the thermal analysis, a finite-element model is being developed to examine the seizure process in railroad bearings as a function of speed, load, and lateral play. Maps will be developed indicating seizure thresholds as a function of these variables. How adapter wear affects bearing life is also being examined through modeling of the adapter/bearing/axle assembly. Obtaining both linear and angular stiffnesses of these components is a major part of the modeling process.