Südbahngesellschaft
The Austrian Southern Railway Company ("Südbahngesellschaft", SB), which operated on the Unter Drauburg – Wolfsberg State Railway, classified the 97.20–23 used there as series 100 with the operating numbers 11–14. The locomotives of the Mürzzuschlag – Neuberg State Railway, on which the SB also ran, were also classified in the 100 series and given the operating numbers 20–21.