3. Basics of running dynamics behaviour

This section deals first with fundamentals of running behaviour in tangent track and curve negotiation ability, including design parameters and operation conditions affecting curving behaviour. Flange climbing mechanism and key design and service parameters affecting derailment due to flange climbing are described as well. Finally the impact of the track geometry and of the vehicle maintenance status/health on the vehicle-track loads is discussed.

Running behaviour on straight track and the curve negotiation asks for contradictory design parameters and/or architecture solutions. The challenge of the designer is to assure, for the defined operation condition, the best trade-off between running in straight track and curve negotiation. In the section dealing with running behaviour in tangent track the fundamentals and the main factors affecting the bogie instability...