Tractor test: Claas Xerion 3300 Back to the future The Claas Xerion is the consummate time traveller, a tractor concept that has been around for aeons and has only really now been brought to market. This, after all, is a machine that was way ahead of its time in the early 1990s, and even today, 12 years on, still carries a certain futuristic feel. So is the Xerion, at long last, ready to make a sales impression? Perhaps just as importantly, is the market ready for Xerion?