For many years now, double-decker trains have successfully formed the backbone of regional traffic. Doubledecker trains are the ideal solution, especially on routes with low platform lengths and a high volume of passengers. The tried-and-tested single-wagon concept of the TWINDEXX Vario� double-decker fleet is now being supplemented with an electrical railcar. Until today, DB Regio AG has ordered more than 50 of these Railcars in different configurations, as 4- 5- and 6-unit train versions. Each of these Railcars consist of two Motor cars and two to four middle cars. In Bavaria, the Main-Spessart- Express will operate in total twelve of these Railcars in the 4-Unit version, all of them are going to be based in W�rzburg. This railcar can be combined with additional middle Cars depending upon the application and desired capacity. The central buffer coupling enables operation with double traction and, as a result, the implementation of a wing-train concept. The trains are comfortably equipped with generous seat spacing and plenty of storage space. Furthermore, the double-decker individual Cars permit the extension and shortening ofthe block train and, consequently, an adjustment to fluctuating demand or future development. As a result, they can be utilised for the most diverse of operational applications in both regional traffic.