This paper outlines work carried out to produce maps of rail material wear coefficients taken\ud from laboratory tests run on twin disc and pin-on-disc machines as well as those derived from\ud measurements taken in the field. Wear regimes and transitions are identified using the maps\ud and defined in terms of slip and contact pressure. Wear regimes are related to expected\ud wheel/rail contact conditions and contact points (rail head/wheel tread and rail gauge/wheel\ud flange). Surface morphologies are discussed and comparisons are made between field and\ud laboratory data
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