How do you add buses to a small bus terminal?
Taken from the Cities-XL forums:
How do I create a new bus line?
Go to the construction menu, click on the terminus and place it. You can create your first bus line straight after placing the terminal.
If you wish to create another line later, you will need to go back to the construction menu and click on the terminus’ icon again. Then click on the terminus already placed and start placing the stops for your new line.