Abstract: A system for operation of an electrical power supply system of a train car, comprising: at least one first sensor and/or at least one second sensor for measuring data related to acoustic pressure in an inner space of the train car; at least one third sensor for measuring data related an output of the electrical power supply system; a processor configured to: process the measured data from one or more of the at least one first sensor, from the at least one second sensor, and from the at last one third sensor, and adjust an operation point of the electrical power supply system based on the processed measured data so as to reduce the acoustic pressure in the inner space of the train car.