The enthusiasm of crews for the new locomotive was at first muted. The boiler was very effective at evaporation (there was already evidence of a combustion chamber at the front end of the firebox), however against that there were numerous teething troubles, e.g. the driving rod bearings were too small. This led continually to overheating. The loosely coupled Prussian box tender led to disturbing riding qualities when running tender-first. Its riding performance was never fully satisfactory. As a result of poor weight compensation, the top speed estimated by Garbe was never achieved and it was eventually assessed at 100 km/h (60 mph).
