SZU is a company running four transportation brands, which connect Zurich with its suburbs.
The four brands tell the story: Sihltalbahn trains are going through a valley (flat). Uetlibergbahn goes on a hill (steep). Buses of Zimmerbergbus go over hills (up and down) and cable cars of Felsenegg are climbing a mountain (vertical).
These vehicle share minimalist design with maximalist color. And that's why they stand out of the crowd.