"soundproofed" meaning in English

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          "ref": "1959 March, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 133:",
          "text": "Over the permanent way of this main line, which is now in first-class condition, the riding of No. D205 was perfectly smooth, and in the sound-proofed cab silent also, and it was a most pleasant experience.",
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