Comment by david-gpu

According to the available information, the failure of the automated system caused six trains to stop. They were then given manually the go-ahead to proceed at full speed (!!!). Six does not sound like a huge number of them to ensure that the train ahead is moving normally before the train behind is told to continue. This sounds like a massive failure in either the protocol or the operator's ability to follow the protocol. Mind boggling stuff, really.

As a Spaniard I am profoundly ashamed that these crashes are happening, when other countries like China, France and Japan seem to manage just fine with their extensive high-speed rail networks.