You are looking at a like new K-950 transformer that was most often issued with some of K-Line's prmotional sets. This transformer is great with a starter set; it is perfect for a small to medium layout and is plenty of power for around the tree.
OR maybe you need something to run your accessories or lights, separate from your train power.
This one is
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AC power
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Compatible with all three rail brand trains
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input: 120vac -50/60 hz
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output: open circuit 17 VAC
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20 VA max output
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includes whistle controller
CONDITION: C-8. Looks like new to new. No box. Tested and working.