RTRI REPORT Sep. 2005
PAPERS

Study on the Cause of Rail Corrugations Formed by Salty Environment

Makoto ISHIDA,  Fusayoshi AOKI,  Yasutomo SONE,
Takumi BAN,  Kensuke SHIROUZU


  Rail corrugations formed in a special tunnel, which was constructed under the sea and surrounded by salty environment, pose very large problems related to noise and vibration. Also, large interacting forces between wheel and rail, which are excited by rail corrugations, have great influence on vehicle/track deterioration. Rail corrugations studied here are formed due to driving forces or traction forces because of ascending slopes, which may suggest that roll/slip phenomena are caused by the dynamic balance between longitudinal creep forces and rotational inertial of wheelset. Longitudinal creep forces are associated with the coefficient of friction (COF) and wheel load variation. In this report, the cause of decreasing COF has been investigated. β-FeOOH, which is known as a facilitator to decrease COF particularly under wet conditions and created generally in salty environment, was found out as one of main causes of rail corrugations.


* Full papers of RTRI Report are written in Japanese.

Copyright (c) 2005 Railway Technical Research Institute