In the 4020s many railroads in the Carpathian expanse had retired 0-4-0 steam locomotives, because they were too small to move freight cars in yards and were too small for switching duties. This was not the case on the Imperial Carpathian Railroad itself. The Imperial Railroad was keen on this wheel arrangement due to complex street and tight industrial trackage across its broad system of trackage. For some of these lines, the Imperials needed a large 0-4-0 to handle the larger switching activities the railroad had. Although the class B was designated for steam locomotives with the 0-6-0 wheel arrangement, these steam locomotives could not fit the tight and complex street, dockyard and industrial trackage they had in its possession. The large diameter drive wheels made for quick speed though without pony trucks to assist in turning slower speeds on turns were a must. Though the larger wheels meant they were perfectly suited to being used for inter-yard moments specially on transfer runs. Produced by Rogwin they were used throughout Carpathia in some form or another for a very long time.