The locomotives had an inside frame which was built as a water tank. The boiler comprised two shell rings. The steam dome with its safety valve sat on the forward shell ring. The smokebox was very short. The smokestack has a Kobel spark arrestor. Later a Prüsmann chimney was used.
The horizontally arranged two-cylinder, wet steam drive acted on the rearmost coupled axle. The Stephenson valve gear with crossed eccentric rods was also on the outside.
The two front coupled axles had leaf spring blocks at the height of the running plate. These were linked by equalising beams. The rear axle was sprung with a transverse leaf spring stack.
The hand brake acted on the two outside wheel sets from the outside. Later the locomotives were given Knorr air brakes. The sanding gear sat on the middle of the boiler and sanded the outer sets of wheels from the outside. To begin with the running gear was covered. The locomotives also had steam heating, a steam bell and a De Limon centralized lubricating system.
