When trains lose their path by disabling a stop, they stop as if they just hit a wall. I would expect that they decelerate on the path they were following prior to the stop disabling.
I can add a blueprint later today, but it will just be a long rail with a stop at the end.
That's how trains work. When they lose the path they're on they stop - you just see it now more because of disabling stops. Mining rails a train is driving on will also cause it to halt.
That's by design.
If you want to get ahold of me I'm almost always on Discord.
So if train loses destination it suddenly gets instant breaks?
And train behind it would also get those or just ram into it (assuming two trains running after the other with sufficient gap where)?
(theoretical situation that might be tricky to reproduce)