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Amdahl's law in effect - which is the reason trains in Germany top out at 300 and most at 250.
I fear that the general public in Germany will not be praising this achievement. The once efficient and punctional trains in Germany have deteriorated severely in the past years due to lots of delayed maintenance causing lots of delays and even regular cancelations of trains. Also the road infrastructure is suffering from delayed maintenance.
The preliminary AV tests in Italy in early 00s were above 500km/h, so I’m not sure what to think.
The ICEs are already plenty fast, the issue is they share rail with the much slower and less reliable RBs. Any delay cascades and you can't just make ICEs go faster to catch up.

On a €/(avg. ICE speed) basis likely makes more sense to invest directly in RB.

What is special about this train? There are trains that already surpass this speed.
This article communicates what this is about very poorly, so I'm not surprised a lot of people are asking "what is so special about this train?".

The answer is: Nothing. Many ICE trains have the capability to go that fast* - and some already surpassed these speeds on test tracks decades ago. It's really nothing special to make a train go these speeds.

What this test was supposed to show is that the real track (not a test track) between Erfurt and Leipzig/Halle can now support trains going that fast. Having compatible tracks is the real challenge (and cost sink) for high speed transport, not the trains themselves. Creating high speed track that is safe and usable in year-round conditions while being affordable to build and maintain is surprisingly hard.

* ICE-3s reached up to 368 km/h in tests, though ICE-4s are designed for more economical speeds in the 200-300 range and currently limited to 265km/h in software for safe operation.

It's also worth noting that ICE train does not mean internal combustion engine train, which was my second read (my first read being some super-deportation-train probably doesn't need to be clarified as even as I imagined that I knew it couldn't be right). It means "Intercity train", which a quick lookup clarifies as an express train between two cities that's longer than a commuter train but with fewer stops than your typical regional train.

Makes sense I'm not familiar with the term, as the closest match in my area is Caltrain (express trains, at least), which is still probably just commuter rail. I guess it's what CAHSR is trying to be.

This is the main point of the news:

"The Erfurt-Leipzig/Halle route was used for the record-breaking journey without any modifications. According to Nagl, this shows that infrastructure investments create a solid foundation that lasts for generations. The insights gained will help with future renovations and the development of new high-speed trains.

The ICE test train used was a Velaro Novo test car from Siemens Mobility. Thomas Graetz, Vice President High Speed and Intercity Trains at Siemens, explained that the test runs provided important insights into acoustics, aerodynamics, and handling. The Velaro Novo is set to establish new standards for capacity, economy, and efficiency.

Dr. Hiie-Mai Unger from DB Systemtechnik led the measurements with the special ICE-S test train. This train is equipped with extensive measurement technology and collected data on the interaction between train and track."

https://www.golem.de/news/deutsche-bahn-ice-testzug-erreicht...

Translation via DeepL

This part is still misleading: "The ICE test train used was a Velaro Novo test car from Siemens Mobility"

The test train used is a set from the late 20th century. So old that its regular brethren are already scheduled for retirement. This is the last generation of ICE that was still using separate locomotives (and with that, limited traction) instead of powered wheelsets distributed all over the full length of the train. The only thing Velaro Novo in this demonstration is that they inserted an unpowered prototype car into the trainset.

It was probably still a half hour late for departure.
That is impressive for a train that runs on Windows 3.11, or did they already upgrade a away qqqqqq1qao Windows 95?
Would be great if they were on time and closures of important routes didn't took 9 months
I don't think Germans want faster trains, they want punctual ones. How about trying to set a record for trains being punctual?