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High-speed train crash in Spain kills at least 64, injures 80
(www.euronews.com)
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The system in use in this case was quite antiquated (60s-70s) but even in this old system there are no trackside signals. From each train the system receives information including direction, braking characteristics.
The system then sends the cab the info the driver needs: Current Max speed, Target Speed, and Target Distance (how far until the train must hit Target Speed). So the equivalent of a red signal would be a Target of 0km/h.
This system had broken down for a couple of days, so trains were being manually dispatched. The controller made a mistake and gave one train clearance to continue at line speed despite there being a stopped train in front of it.
Yeah it and it sounds like the other train was stopped by positive controls? At least from the translated version of the leaked audio.
If that's the case, it's odd the same didn't apply to the moving train.