Abstract
In this work, dynamic behavior of rail vehicles during curve negotiation when traction or brake torque is applied has been studied. From computer simulations using one car body models assuming nonlinear characteristics of the contact force between wheel and rail, the steering truck with unsymmetric suspension proposed by one of the authors has superior curving performance in terms of wheel lateral displacement and attack angle even acting traction/brake forces. If the attack angle were zero, the influence of traction forces on steering ability would be negligible. This is also proven by the simulations of curve negotiation of the guided steering vehicles.
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