“…Due to the importance of the air brake distributors response to the pneumatic signals transmitted through the brake pipe, there were performed numerous theoretical and experimental studies regarding these aspects, based on more or less simplifying hypothesis, all tending to highlight mainly the brake cylinders filling characteristics as accurate as possible (Belforte et al, 2008;Cantone et al, 2009;Piechowiak, 2010;Pugi et al, 2004Pugi et al, , 2008.…”