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The engine to one of these atomic airplanes is on display at Idaho National Labs, near Sun Valley, Idaho.

Two of them actually! Those are HTRE-1/2 and HTRE-3 mentioned in the transcript, (and shown back in the day here [1]). HTRE-1 was disassembled and turned into HTRE-2 which is why you only see two of them now.

[1] https://youtu.be/V-8q8INxQEY?t=372

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