With its characteristic design - a carrying axle placed well to the front and two coupled axles at the rear under the outer firebox they asserted themselves over the rival Bavarian Pt 2/4 N and H classes and, after the demand fell for the services for which they were originally designed, they continued to be operated well into the 1960s on south German branch lines.

The doors on the rear wall, which had become superfluous, were in some cases removed in order to provide a larger coal bunker.

The Deutsche Bundesbahn took over 89 locomotives; four remained in Austria, three apparently as a result of military action were no longer worth repairing and one had been mustered out in 1935.

After spending almost forty years as a memorial in Mühldorf am Inn, the Bavarian Branch Line Union (Bayerische Lokalbahnverein) was able to place the loco in service again in 2005.

After the Second World War, numbers 70 086, 092, 095 und 096 remained in Austria, and were preserved as ÖBB Class 770.