Wheel and rail is one of the most important material used to support and guide rail vehicle safelyrnand smoothly. Since wheel and rail suffers from various interacting mechanical and thermalrnforces, friction modifiers, various contaminants and environmental atmosphere, wear poses largernproblem on wheel and rail.rnWheel and rail wear can be result in an extensive cost for truck owner, if it is not predicated andrnprevented in an efficient way. To limit these costs, one measure is to predicate and prevent wheelrnand rail wear through wear modeling.rnThe purpose of this research is to investigate the influence of heat treating both wheel and rail atrnthe same time on rolling/sliding wear of wheel and rail.rnThe rolling/sliding wear of three pair of rollers used to model wheel and rail material is studiedrnusing twin disc rolling/sliding wear testing machine. The three pair of rollers used in this study isrnmanufactured from carbon steel having similar hardness and chemical composition as that ofrnstandard wheel and rail. Then the two pair of rollers is heat treated in an electric furnace tornimprove their hardness. Heat treatment was done by heating the rollers to austenite temperature,rnholding at that temperature for 45minutes for uniform temperature distribution. Water or air plusrnoil are used as cooling median.rnHardness of the rollers is measured using Rockwell hardness C scale of indentation hardnessrntesting machine. Spectrometry analysis is also carried on the rollers to know the chemicalrncomposition of rollers. Roughness of rollers is measured by using surface roughness testingrnmachine.rnResults from hardness test showed that the hardness of the roller can be increased by heatrntreatment. Result of spectrometry analysis shows that the chemical composition of the rollerrnagrees with the chemical composition of wheel and rail. Twin disc wear test of the roller showsrnthat rolling/sliding wear of wheel/rail can be improved by increasing the hardness of wheel andrnrail by heat treatment.