In 2007, Flytoget announced that they had ordered a fourth car for each of the units. This increased the capacity of each unit by 40% to 244 seats, and allows the company to manage the annual 10% growth in passengers. The delivery of the fourth cars started in 2008 and were built by Bombardier Transportation, who has bought ADtranz, with the rebuilding scheduled to be completed during 2009. The rebuilding created several challenges for Bombardier, since most of the components used in the class were no longer available. Significant components such as the car body and rectifiers had to be built by Bombardier based on abandoned production lines, and many of the original manufacturers for the interior have become defunct.