Very big modern train horn. It is a construction train, stationary (no Doppler-Fizeau effect). Sound recording at about 100 meters. UCS Category: TRNHorn. Duration: 00:07.
This synthesized voice is that of Google. In French, she says: "Vous avez un message" (You have a message). UCS Category: ROBTVox, VOXFem. Duration: 00:01.