MxV Rail conducted a series of full-scale, wheel-rail (W/R) rolling contact tests using the Rolling Contact Fatigue Simulator (RCFS) to generate W/R contact creep curves and determine the friction coefficient (saturation value of creep curve). The tests used wheelsets with new and worn Class C wheels and intermediate strength rail samples to investigate the effect of wheel loads, contact pressures, and surface properties on the tribology performance of the W/R interface under dry contact conditions.  Findings from this study could form a base case reference for W/R contact friction coefficient determination, friction control, and friction modifier product characterization. Further studies are in progress that will investigate the contact pressure effects on the W/R contact creep curve under various friction conditions.  BACKGROUND  High friction between wheels and rails can cause W/R surface damage, including wear, rolling contact fatigue (RCF), and metal flow. Friction control has become an important strategy for W/R…