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I'm currently implementing this functionnality with a on_nth_tick handler which call someSurface.find_entities_filtered() with a filter over train-stop entities, and then checking state throught control behaviour associated....
But I think this state change is already detected into C++ code to trigger the activated state, and raising a new event here would be much more efficient that my current implementation...

Fractaliste wrote: ↑Thu Jan 17, 2019 7:42 pm But I think this state change is already detected into C++ code to trigger the activated state, and raising a new event here would be much more efficient that my current implementation...

While true, it would have too much overhead and be fired too frequently compared to not having the event at all (as it is now).

Fractaliste wrote: ↑Thu Jan 17, 2019 7:42 pmcall someSurface.find_entities_filtered() with a filter over train-stop entities, and then checking state throught control behaviour associated...

You can improve your implementation by creating a global table of train stops indexed by unit_number and updated on built/destroyed events. This skips the find_entities_filtered() overhead.