Railway vehicle pneumatic systems are included in many elements, such as the brakes, suspension, and doors. To date, these systems have been designed through experience, and evaluation of the unsteady characteristics of these systems has not yet been attempted. The railway pneumatic system termed a vacuum toilet serves passenger comfort. To assess the efficiency of this pneumatic system, we measure the pressure and flow rate of the vacuum toilet using an air power meter which applies the principle of the quick flow sensor. We also confirm that it is possible to improve the efficiency of the toilet by changing the pneumatic element. The simulation results approximated the experiment data.
