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When adding/removing carriages to an automatic train parked at a train stop it switches to manual without raising on_train_changed_state.
Expected behavior would be to raise on_train_changed_state(event.train.state = defines.train_state.manual_control)

In that instance the state is not changing. The old train is deleted and a new train in a different state is created. Thus no event is fired.

That's expected behavior.

Is there an on_create event fired or do you have to check for this in on_tick?

Optera wrote:Is there an on_create event fired or do you have to check for this in on_tick?

You should be able to find some ideas on how to handle this by looking at smart-trains mod or stdlib/trains stuff.

Nexela wrote:

Optera wrote:Is there an on_create event fired or do you have to check for this in on_tick?

You should be able to find some ideas on how to handle this by looking at smart-trains mod or stdlib/trains stuff.

Quite some hacks needed to get a train stop notice changed train states reliably through on_built_entity, on_preplayer_mined_item, on_entity_died.
It still feels like on_train_changed_state should fire when creating a new train with the same unit numbers, backer names and object references.