The system is flexible and can be paired with regular ALTPRO wheel sensors as well as „M“ sensor series. By processing raw analogue signals from wheel sensors directly beside the rail, BO23-A shows great results in harsh environments. As signal is processed directly at its source, there is no possibility for it to be influenced on its path to the indoor unit. The system shows exceptional results in railwheel distinguishing from other metal objects and adaptation to environmental influences like temperature change, EMI, overvoltage, traction currents, different rail and wheel/train profiles, worn-out flanges and rails. Furthermore, implemented self adjustment to aging of system components and preventive maintenance features increase the availability of the system.