Need help identifying the common terminal for a Marx 1209 transformer

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I have a Louis Marx 1209 transformer 50 watts that I want to use to run the accessory rails on my atlas track. I need to identify the common terminal but the transformer is not labeled at the outputs other than "To Track". I'm sure that if that is all I was doing with the transformer I would be fine. Does anyone have any idea which one of the terminals is common?

Thanks,

Paul

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2/12/161:27 PM

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