Recorded with samson meteor connected to the phone in the moscow metro at 6 a. M. In the train that passed two stations of the lyublinsko-dmitrovskaya line. There were no people in the train car. The sound was refined with adobe audition.
This is on one of the metro stations in milan. You can hear some chatter from people waiting for the metro. The metro arrives, i get on and the metro leaves. I recorded this on the phone, so apologies for the quality.
Recorded this sound on my xaomi redmi prime 3s mobile phone in a natural setting inside the living room. This recording has been done in bangalore, karnataka, india at around 18 hrs ist on december 10, 2016.