Swiss Army Swiss Bus Evolution 10 The Swiss Bus Evolution 10 Swiss Army Knife by Wenger features a trademark three-tone horn and yellow Swiss Post Bus on the handles. The iconic Post Bus carries over 120 million passengers each year. Now the Swiss Bus Swiss Army Knife lets you can carry a little piece of Switzerland without leaving home. The Swiss Army knife was built on the premise of portable functionality. In 2005 Wenger developed the first ergonomic Swiss Army Knife, making resourcefulness more comfortable than ever before.