Originally in 1982, a train with two powercars and six coaches was planned for, one of the coaches being a measurement coach and the other five being demonstration coaches with varying interiors, totally capable of holding up to 600 passengers. As early as November 1982, the number of planned coaches was reduced to two, on grounds of costs. In March 1983, the leadership of the Bundesbahn decided to allow the development of a third coach, in order to possibly offer more seating variations, particularly the second class.