 Because the second stage, connecting the tunnel to the line along the Rhine river has not yet been tendered, but is expected to cost another 100 million, total cost is likely to exceed 1 billion euro.Since the last traditional tramcars were retired in 2006, the Stadtbahn's active rolling stock consists exclusively of modern articulated light rail vehicles.All of them are about long, wide, seat approximately 70 passengers and are approved for speeds of up to .