Howto fix a broken/interrupted Bus line?

I have placed a Bus terminal and a route through my city.
Unfortunatley, this line is 'broken'/'interrupted' at some point.

How can I fix such a broken line?
I can't find a possibility to 'extend' the existing line or 'add' the missing piece.

I'm not sure about this:
Does a broken Bus line work at all?

To verify if a bus line works even if it has been interrupted, you can take a look at the bus line pannel accessible from the top menu. If there are passengers, then the line is working.

And for the way to fix it, there may be better solutions but I think I would just delete the line and re-create it.

This is all not tested because my game is not currently installed.