Is this the Polar Express tender that comes with the set or a different one? If you have checked the wires on the Polar Express tender and the whistles on other tenders are working then you probably have a defective tender and I'd let Lionel send you a new one. What does Lionel say you should do?
Welcome to the forum! Just a suggestion... posting your question here instead of in someone else's thread is called "hijacking" and is considered rude. Posting your own threads will probably get you better results.
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