During the introduction of new systems in the control tower, continuous validation from controllers assures that the right system is being built. After deployment, ab-initio and refresher training is required to best possibly use the system in case of emergencies, system failures and unusual situations. The ATRiCS Tower and Cockpit Simulator (TOPSIM) is a generic simulation platform that can be configured to model any airport and airspace infrastructure. It can easily be setup on-site and can operate without any pseudopilots.