In 1861, Escher Wyss delivered two freight locomotives of the later type D 2/2 to the North East Railway. Two years later, Esslingen delivered four more of the same design to the NOB's subsidiary Zurich-Zug-Lucerne Railway. These locomotives had outside frames, outside cylinders and inside Gooch valve gear.

They had two driving axles which carried a total weight of 26 tonnes, was was a high axle loading for that time. Additionally, the Beugniot type tender had to carry six tonnes of the locomotive's weight. Due to the short wheelbase of the two driving axles and the absence of guiding axles on the locomotive itself, they tended to nod at higher speeds, what led to the limitation of the top speed to 40 km/h. Nevertheless, they were powerful and were only withdrawn in 1876 and 1878.