expansion stage. The engine drove the second coupled axle. Both coupled axles as well as the carrying axle were fixed rigidly into the frame. The wheel spokes were made of forged bar steel. Later cast wheel spokes were fitted. Because it had an inside drive the second axle had to be designed as a crank axle, which is remarkable, bearing in mind the manufacturing technology of that time. A technical innovation was the trailing axle which had been intended by Schubert mainly to improve the locomotive's riding qualities. It was subsequently determined to be superfluous and was removed in 1840. From 1842, however, the operation of twin-axled locomotives was banned on safety grounds, so the trailing axle had to be refitted. The brake was initially a screw-operated band brake which acted on the two driven wheels from the top. Because this did not prove suitable due to high wear and tear, it was later removed. Replica locomotive On 11 October 1985, a working group was established by the East German government's Ministry of Transport for the construction of a replica of the locomotive. The aim was for its inaugural journey to form part of the 150th anniversary celebrations of the opening of the first German long-distance railway from Leipzig to Dresden on 8 April 1989. Like the Adler, few original design documents existed at that time from which the replica could be built. The basis of the new design drew heavily on a blueprint of the original drawings from 1838. The dimensions and technical data were derived from the book published in 1839 by NNW Meissner. Building a replica using the original manufacturing techniques was not possible. In building the boiler current regulations had to be followed. The steam engine was a major headache. Originally the Saxonia only had a simple lever valve gear which did not enable any kind of steam admission control. For the replica Saxonia a Stephenson valve gear with open rods was planned. The design and manufacture of the replica boiler was entrusted to the VEB Dampfkesselbau Übigau in Dresden, which had built the original boiler 150 years earlier. All other components were manufactured by various Deutsche Reichsbahn facilities. The final assembly was carried out at the Halle repair shop (Reichsbahnausbesserungswerk or Raw). The manufacture of components was taken on by the Bahnbetriebswerke (Bw i.e. locomotive depot) at Dresden, Oebisfelde, Berlin-Pankow and Weissenfels as well as