I think everyone complaining about DB should be forced to live in the UK for a short while first. My 15 yo daughter has just come back from her first trip to Koln to stay with friends. She was wide eyed with how well everything worked, and how nice the trains were. It was interesting to me to see that she saw it too and it’s not just jaded politics that makes me think the UK is going to the dogs.

My experience is at UK trains are a bit more reliable at turning up on time than DB. German trains tend to be cheaper though and you sometimes have to do stupid ticket-splitting stuff in the UK.

You can buy from Polish Railways too.

https://www.seat61.com/trains-and-routes/berlin-to-warsaw-by...

The EU seemed (2021) to be working on it https://ec.europa.eu/commission/presscorner/detail/en/qanda_...

Oh, login here specially to reply. Not really, pkp site is an old slow garbage with bugs, it makes everyone cry. So, you can buy, just do not expect it would be a good experience buying.

Apparently, railway companies cannot make sites.

Couldn't you book with another ticket seller? Like trainline.eu?

I tried Omio and one more, but this specific direction was not available there via train. DB website was simply showing an error at the last step. A month later, by the moment error was gone all tickets appeared sold.

If you run into the problem again try the website of the Polish trains pkp.pl. You'll probably have to Google translate some stuff but it works well.

There is an english version. But pkp site loves to give you errors and timeouts too.