This paper presents a study on microscopic mechanism of the weartype rail corrugation and proposes a wavelength locking mechanism of worn profile rail corrugation. The microscopic formation mechanism of rail corrugation was analyzed under this wavelength locking mechanism. A smallscaled roller rig with two simulation wheels has been designed to verify this formation mechanism of the rail corrugation by experimental and the corresponding line tests were also carried out. The lateral creep forces at variable loadings can be measured in this test rig. The creep forces vs. creepage rate curves have been obtained under variable loadings. The results have compared against with the micro mechanism of rail corrugation proposed. It is proved that the theoretical analysis of the microscopic mechanism of wear type rail corrugation. Therefore, this validated theory can be used to explain phenomenon of many types of rail corrugations.