The sound came from a tram arriving at the recorder's stop. You can hear the sound of a tram arriving with high speed. Located in Tampere, Finland. This was recorded with Iphone X (2017), Apple, MEMS microphones. Recording App: Audio Recorder (Jakub Bartus) This sound serves as training data for our Audio & Speech Processing Project. Also, it helps recognize the sound of trams arriving in daily occasions of Tampere, Finland for people in need.