Comment by 1718627440

I'm not sure, I can follow you. The trains were in LZB mode, because you need that in order to operate a high-speed train. You can't see the signals required for PZB at high-speeds.

> then when LZB goes down it has to slow down/wait/follow some different protocol

The trains did stop when the LZB reported an error, like they should.

> follow some different protocol

That is manual operation, which I suspect they failed to do.