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"pure" alumnimium is pretty rare. A lot of aircraft structure is 2024 (often T3)- a duralumin-type alloy, presumably train bodies are made of something similar or 7000-series (as found on newer aircraft)?
"pure" alumnimium is pretty rare. A lot of aircraft structure is 2024 (often T3)- a duralumin-type alloy, presumably train bodies are made of something similar or 7000-series (as found on newer aircraft)?