or 2'2' T 34 tenders. Their coal capacity was 10 tons of stone coal, and the water tank held either 30, 32 or 34 cubic metres of water. The prototype locomotives, 01 001 to 01 010, were supplied with the smaller 2'2 T 30 tenders, because there were not enough large turntables around. Later these tenders were only used if they were absolutely necessary, e.g. in cross-border services with the Netherlands. From the second series (01 012 et seq.) on, the Class 01 was furnished with rivetted 2'2' T 32 tenders. The welded tenders, class 2'2' T 34, appeared only by way of exchange (mainly from brand new Class 44) locomotives. Thereafter they were almost the only ones used during the war years and after the Second World War, because they had a larger water capacity. Class 01 locomotives remained in service with the Deutsche Bundesbahn until 1973. In the DR, they were still working up to the early 1980s, largely in their original state with large smoke deflectors. They were legendary in their last years for hauling the D-Zug services on the Berlin-Dresden route up to autumn 1977. Only when the large Soviet DR Class 132 diesel locomotives arrived, the Class 01 express train locomotives were finally forced out of scheduled services in the GDR after almost 50 years. Rebuilds Rebuilds 1950 to 1957 (DB) In 1950 and 1951, the Deutsche Bundesbahn converted locomotives 01 042, 01 046, 01 112, 01 154 and 01 192. They were enhanced with a Heinl mixer preheater by Henschel and a turbo feed pump. In addition combustion chambers were installed in the boilers. Finally the conversion was rounded off with the replacement of the original smoke deflectors by Witte deflectors, which in spite of their considerably smaller size were just as effective as their larger predecessors. Four of the five modified locomotives remained in service until 1968. Rebuilds 1957 to 1961 (new DB boiler) From 1957 the Deutsche Bundesbahn rebuilt a further 50 vehicles. These engines were given welded, high-performance, steam boilers, which had already been used on the DRG Class 01.10. In addition a new mixer preheater system was installed in the smokebox and numerous friction bearings were replaced by roller bearings. Changes to the cylinder block, running board, a shorter chimney, front apron (Frontschürze) and locomotive frame, as well as the missing feedwater dome, all gave the locomotives a different external