In estimating the probability of climbing derailment, we generally consider that a wheel would not derail when the derailment coefficient is smaller than the critical value calculated by the "Nadal's equation." To estimate the derailment coefficient, we perform time-base simulation, but it needs a long calculation time. Therefore, we propose a "Lateral-force/Wheel-load Estimation Equations" to easily estimate the wheel-load, lateral-force and derailment coefficient based on a theoretical study and analysis of actual train running data. Here we describe a composition of lateral-load/wheel-load estimation equation, and methods to calculate the limit of derailment coefficient and estimate room for derailment by using the "Ratio of Estimated Derailment Coefficient," that is a critical derailment coefficient/ estimate derailment coefficient.

Copyright (c) 2001 Railway Technical Research Institute