At least 36 dead, scores injured as trains collide in Greece

Good point. If there is such a thing as a dedicated "freight track" there, then you'd expect caution & queries from the passenger train crew.

It's probably too early to make speculations but sounds like a "Not my Job" kinda problem.

From what I gather from Greek news [1], there was no separate freight track. But there is one track per direction under normal conditions. One direction was knocked off by a power failure at the time of the accident, so both directions were running on a single track for that segment. Then, some signaling-relatd failure sent two trains on a head-to-head collision.

[1] https://www.news247.gr/koinonia/sygkroysi-trenon-sta-tempi-p...

Because most probably it was the result of systems failure, a thing which interests many on HN (I'm part of that group).