The three locomotives were delivered to the LDE in 1849 by Hartmann of Chemnitz with works numbers 11 to 13.
The outer firebox was equipped with a semi-circular dome that extended forward over the boiler barrel and acted as a steam collection space.
The two spring balance safety valves were located on the dome of the outer firebox.
The steam cylinders were located externally, unlike those on English locomotives, which avoided the need for a cranked axle that would have been expensive and difficult to manufacture.
Exhaust steam was led from the valve chest to the tender through a low-down, 100 mm, connecting pipe.