@tinydoctor 
Even the high-speed ICE you took had its problem as recently one had to be evacuated as it lost its electricity power supply and ACs broke down. On-boa5rd travelling soldiers and police officers shared their water with passengers...

But due to tight budget I need to take 5 regional trains to reach my destinations. And although I have stopovers of 30 minutes on average, that'll work only if all trains are on time. Plus it's a Friday,m plus it's the beginning of the summer school holidays in several regianl sates, so trains will be crowded. I don't even expect the restrooms onboard to work properly, and if they do, they'll be filthy.

I guess I would rather try Amtrak than using German railway.