1) The guy cooking wurst under the big sign at Zurich main station....very tasty
2) Doner Kabob at many locations around the country. I get it on flat bread (tortilla) with lettice,tomato, and yogurt sauce...yum. My favorite in all of Switzerland is at Big Baba's in Zug at the Bahnof.
TrainLover
ps- and don't forget a nice Appenzeller Quolfrisch beer!