We propose bainitic steel as the most suitable grade steel to prevent rails from initiating darkspots and extend their life as the result of research on the development of new type rails that eliminate contact fatigue layer which can be an initiation site of damage spontaneously by promoting wear properly. From the field test results of the proposed bainitic rail, we have clarified that the most suitable hardness of the new type rail under the condition in service ranges from 260HV to 295HV, in view of wear amount, heat check, diminishing irregularity in welded parts of rail head, tolerable scattering range of hardness in manufacturing and so on. On the basis of the obtained test results, we propose the specification of bainitic rail for application.