In this trip report video you get to see Germany's latest bullet train, the ICE 4. I did the trip in March 2023 in First Class starting at Köln Hbf with Hamburg Altona being the destination.
In this video you also learn about Germany's railway infrastructure and many places along the way. Enjoy!

If you have suggestions for future videos I'd be very happy to read them in the comment section below. In case you have questions about the trip please feel free to ask them there as well. I read all comments and answer most of them. Thanks!