Saxon IX V and IX HV

After less successful trials with Mallet locomotives for heavy freight traffic, the Saxon State Railways ordered a new locomotive with the wheel arrangement 2-8-0. To ensure curve negotiation, the last driving axle was designed as a Klien-Lindner hollow axle that could be adjusted radially and was controlled by the movement of the tender. It was mounted in an outside frame far behind the third driving axle. Additionally, the side play of the leading axle was 50 mm, while it was 17 mm for the second driving axle.

They were two-cylinder compounds with a Belpaire firebox. After two prototypes from 1902, series production started in 1904. The first 20 were built with a saturated boiler and slide valves which were designated IX V. 30 more superheated IX HV were built with piston valves. The first batches had a large steam collecting tube above the boiler, this was moved into the boiler barrel in later batches to improve accessibility to the firebox.

The saturated variant was rated at 1,330 tonnes with 50 km/h on the level and 615 tonnes at 25 km/h on one percent inclines. When they were incorporated into the Reichsbahn, 16 XI V and 25 XI HV were still operating. The saturated ones became class 56⁵ and the superheated ones became class 56⁶. Modifications carried out by the Reichsbahn included the addition of a feedwater heater and fixing the Klien-Lindner axle to increase reliability. In 1929, the last ones were retired.