There were scarcely any differences between the various build series. Not until 1896 were minor changes made to the heating areas, the weights and the coal and water capacities. The rigid mounting of the driving and carrying wheels and the location of the cylinder just in front of the carrying wheel did not prove a success. The D IX locomotives could haul 170 tonnes (170 long tons; 190 short tons) on the flat at a speed of 65 km/h (40 mph), on routes with a 2% incline they could manage 95 tonnes (93 long tons; 105 short tons) at 20 km/h (12 mph).
Apart from one engine, which had already been retired by Bavaria, the Reichsbahn took on all the engines. Some were taken out of service even before 1925, the rest had followed by 1932.
No examples of the Bavarian D IX have been preserved.
Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 64–66. ISBN978-3-946594-21-5.
Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 60–96 (EFA 1.3) (in German) (4th ed.). Düsseldorf: Alba. pp. 40–41. ISBN3-87094-083-2.
