An MTH Z4000 is the transformer of choice. It has a built in cooling fan that runs constantly and will keep the transformer nice and cool for the entire time it is turned on. Also its a whole lot less expensive than the ZWL from Lionel. I run one on my outdoor G gauge layout in the much warmer weather months even when the temkps are in the 90's and the Z4000 never gets hot. I run G gauge MTH locos outdoors with the ac and the DCS. Hope you will consider this option.
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