Gameplay Need Help With Coupling.

I'm trying to learn the timetable editor, and can't get a couple to command to progress.
In game I follow the couple objective, but it never progresses after I couple to it. It just stays stuck with "couple to 12 vehicles" on the screen.
This is how the couple node is setup:


Any help would be appreciated!

 

I am no expert but you might wanna check if the is actually the of the

 

It is yeah, if I set it to the rear of the Loco, it won't compile as it says they wont line up. If I set it to the other side of the wagons, the marker is on the far side of them.

 

So I would remove the location on the couple node effectively not giving it any location. I don't know if it'll fix your issue but for me if your coupling I wouldn't think you need to indicate a location as the dispatcher will still route you to the formation your coupling to.