ABSTRACT
Train dynamics investigates the longitudinal interaction between adjacent cars, addressing such questions as the causes of in-train motion, the magnitude of the resulting loads, and the potential for train separation or buckling. Experience suggests that train action is accentuated by increased train weight and length. The significance of this problem to North American railroads is underscored by the continuing trend to heavier and longer trains. Hydraulic cushioning units are similar to automotive shock absorbers. North American railroads have traditionally assumed curving resistance to be 0.8 lbs per ton per degree. The objective of the L/V ratio calculation is to predict the likelihood of derailment due to in-train forces. TOES is designed for mainframe, and ultimately, personal computer environments. Improved draft gear modeling and L/V ratio calculations and the integration of a theoretical air brake model within a train action simulation are major advances.
