The Royal Saxon State Railways designated four-coupled, Atlantic (4-4-2) express locomotives as Class X

One of the locomotives was displayed at the Paris World Exhibition in 1900 and was awarded the Grand Prix.

The Royal Saxon State Railways took over the two prize-winning locomotives and procured another 13 up to 1903 that differed from the prototypes, particularly in terms of the diameter of the carrying axles.

The X V was employed on express train duties on the plains where its riding qualities and economy were impressive.

On the two prototypes the air pump was on the right, on the remaining locomotives it was installed on the left hand side.