A couple of carriages of the whole tram will be with the graphic and they will say something like "the sweetest carriage ever!" and of course the claim of the brand "I need it sweet". Those carriages maybe could be decorated (inside) with candies and chocolate (Halooren´s products) like the "Charlie and the Chocolate Factory" movie. In there, some promotion girls will give some Kugeln to the passengers to make the way sweteer and promote the brand.
Sweeten Up The Tram
Other ideas can be: "your way, sweeter" or "the sweetest tram".
WORK IN PROGRESS