Book with signatures "Eisenbahnflakzug Führerhaupquartier"

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I bought this book today and I think it is pretty remarkable.

It has been signed by members of the FLAK train of Hitlers Heaquarters.

Who can provide me more details about this unit or is there somebody who recognize the signatures

Thanks guys

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And two detailed pictures

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Nu reaction at all ??
Is there nobody who can give me more details about this unit ??