The ZW was indeed a crowning achievement by the Lionel engineering staff. Had my first (new) one about 1955-56 and my second (used) in 1989. Both performed flawlessly with my then analog trains. MTH's crowning achievement in the modern era was the UL approved Z-4000 which, like the ZW, is an iconic performer. I have two Z-4000's that are decades old with no issues. Kudos to Lionel and MTH for these innovative and durable transformers!
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