The acoustic deterrents, which minimize the chance of bear presence on the rail at the time of train arrival, were mounted on masts on two problematic sections of the railway Ljubljana – Koper at the end of 2015. With installation of acoustic deterrents on electric poles along the railway section Postojna – Prestranek (5km) and on the section Rakek – Postojna (3km) we provide greater security for bears and thereby lower mortality of this species in the area of railway tracks in Slovenia.