One of the tasks in WP1 in In2Track3 is the development of a so-called Whole System Model (WSM) for switches and crossings (S&C). The WSM is a simulation tool for holistic evaluation of S&C designs.

The purpose of the WSM is to allow for design optimization of S&C to obtain good and durable designs that give low life cycle costs. The WSM is based on physical modelling of the S&C system. Dynamic interaction between S&C and passing vehicles is considered along with loading and deterioration of S&C components over time.

The animation above shows the simulation of dynamic interaction between a bogie and a crossing panel that constitutes a part of the WSM. The red force arrows illustrate the wheel-rail contact forces between the rails and the leading wheels. It can be noted that the wheel that passes over the crossing in the middle of the crossing panel experiences a much more dynamic excitation compared to the outer wheel. This is because of the rail irregularity created by the crossing transition.