Trans-Siberian Vacation?

Has anyone ever taken a Moscow-Beijing (or Beijing-Moscow) vacation?

My wife and I are putting together a big combined trip for my 40th birthday, her 40th birthday, and our 20th weddings anniversary. We love culture and food, authentic and unique experiences, and some adventure (up to a moderate fitness level). As such, we are looking for something fun!

I would be very appreciative for any tips, advice (e.g., particular companies to use), or general input on one of these trans-Siberian trips. Even advice for alternate, better plans/trips would be welcome!

Thanks in advance for your help!

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