The Siemens Nexas is a class of electric multiple unit trains built by Siemens for Melbourne's suburban network, entering service in the early 2000s and now operated by Metro Trains Melbourne. Recordings of its door chime and closing sequence circulate among trainspotters and transport fans who document different fleets around Australia. Clips like this are shared on soundboards and in videos to preserve familiar commuter sounds, compare them with other Melbourne trains such as the Comeng and X'Trapolis, and add local detail to edits.