The station wagon has been in long eclipse in the U.S., so General Motors initially designed the sleek CTS wagon primarily for export to Europe, where luxury wagons are popular. Now Cadillac is going to see if the vehicle will appeal to the post-SUV American buyer as well. The CTS wagon is built on the proven CTS chassis and is powered by a V-6 engine with a six-speed gearbox that's expected to get 26 m.p.g. on the highway. One of the new features of the wagon is an antitheft protection system that immobilizes the car through GM's OnStar network.