Later, these were largely adopted by the other state railways (Länderbahnen) in Germany.
These norms are defined by engineering drawings to 1:40 scale on individual sheets and show the locomotives and wagons as full design drawings, referred to by their sheet (Musterblatt) numbers.
The drawings were regularly updated as technical developments occurred.
The design drawings for goods wagons were of special importance.
A-group wagons are those built to the standard drawings of the DSV.