1. 1) Uchida, M., Morimoto, M. et al., "Actual Status of Track Irregularity Growth at High-speed Line of Narrow gauge and Verification of the Estimating Method," RTRI Report, Vol.12, No.3, 1991 (in Japanese).
2. 2) Miwa, M., Ishikawa, T. and Oyama, T., "Modeling the Transition Process of Railway Track Irregularity and All Integer Mathematical Programming Model Analyses for Making Optimal Track Maintenance Schedule," Journals of the Japan Society of Civil Engineers, No.681/IV-52, pp.51-65, 2001.
3. 3) Kawaguchi, A., Miwa, M., "An Evaluation of the Alignment Growth Model by Data Analysis," Jointed Railway Technology Symposium 2004, pp.171-174, December 2004.
4. 4) RTRI, "Technical Standard for Ballasted Track Structure", 1997.
5. 5) Terada, K., Miwa, M., et al., "Modeling Alignment Irregularity Condition and Transition Model by Statistical Analysis," Jointed Railway Technology Symposium 2004, pp.179-182, December 2004.