Starting in 1925, the Deutsche Reichsbahn-Gesellschaft allocated this five-coupled narrow-gauge locomotive to the classes 99.64 and 99.65. The 99.650 and the 99.651 first came to Stuttgart and were then handed over to the Bottwartalbahn, where they were retired in 1969. Between 1923 and 1927 the locomotives were rebuilt. They hardly differed from their predecessors, externally they could be recognized by the flatter steam dome. In 1960, as part of a major overhaul, the VIk received a new boiler and some welded water and coal boxes. This narrow-gauge locomotive is a superheated steam locomotive in which the first, third and fifth axles were movably mounted to the side to enable it to drive in tight curves on narrow-gauge lines. The drive was on the first and fourth axle, in the new building.