The type IV T designates tank locomotives with a 2-4-2T wheel arrangement for fast local transport, which were built by the Saxon machine factory Hartmann based on the Prussian T 51. Despite some serious problems with the running characteristics, 91 were built. Production began in 1897, when the locomotives were still designated class VIII bb T according to the old scheme and bore the names of small Saxon towns. It was not until 1900 that they received the designation IV T and the numbers 1701 to 1791.
What was special about the chassis was that the two driving wheel sets were very close together with a wheelbase of only 2,000 mm and the carrying axles were 2,400 mm apart in front of and behind. Since the latter were designed as Adams axles and could therefore move independently, the locomotives ran unsteadily at high speeds and sometimes even derailed. Otherwise, they were conventionally designed with a two-cylinder saturated steam engine and were connected on the second driving axle. The plate frame also served as a water tank and was later extended with additional tanks next to the boiler. The plate thickness of the frame was initially 12mm, but was later increased to 20mm while weight compensation holes were filled again.
In addition to the counterweight brake, the Westinghouse air brake was also installed from the first batch. From a later batch, the supplies were enlarged and the other locomotives were rebuilt in the same way. The water supply was increased from 5.6 to 7.5 m³, and the coal supply was increased from 1.6 to 2 tonnes.
From 1925, 85 were in service with the Reichsbahn, which were designated class 713 and thus given the numbers from 71 301 to 71 385. In the period that followed, the numbers shrank quickly, so that the East German Reichsbahn only received ten locomotives that were used until 1955. Two were used in Czechoslovakia, which had come there during the war.
