The DT1 was the first generation of U-Bahn trains built for Nuremberg, entering service in 1971 and remaining in regular operation until 2023. After retirement, preserved examples continued running as museum trains, including a ride documented on 18 June 2025. Online, riecht nach DT1 became a shorthand among local transit fans for that instantly recognisable old-train atmosphere. The clip circulates in German transport communities and meme edits where the smell reference works as shared local knowledge rather than an explained punchline.