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It has been difficult to detect lateral contact point of rail and wheel, though technology of instrumented wheelset has advanced in thelast 20 years. Therefore, it is interesting and worth while to study on method of measuring rail/wheel contact point and contact force ofrunning railway vehicles, since many things in real rail/wheel contact phenomenon are still unknown.Recently, we have tried to develop a method of measuring rail/wheel contact point by improving conventional method of measuringwheel load and lateral force in which strain of the disk surface is used for measuring these forces.Firstly surface strain on disk type wheel is analyzed by an FEM program, NASTRAN, under the condition that vertical, lateral, orlongitudinal force separately acts on various points along the wheel profile. By the calculated result, it shows possibility of detecting therail/wheel contact point by means of measuring lateral distribution of compress strain which changes according to the load position, i.e.rail/wheel contact point.
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