The locomotives of the Pfalzbahn with the numbers 26 to 63 were express train locomotives, 17 of which have been produced since 1853 by the Esslingen and Maffei machine works. With the Crampton design, smoother running was achieved and speeds could be reached that were actually classified as unrealistic up to this point. Despite the fact that the drive wheels are only 1,830 mm in size, this type is said to have reached speeds of up to 120 km/h. The French Crampton locomotives, which were also designed for 120 km/h, had a wheel diameter of more than 2,100 mm.

However, this advantage was paid for by the fact that the large driving wheels behind the boiler only applied a small amount of adhesion and therefore little traction was available. The adhesion mass was 9.2 tonnes for the first engines and reached 9.7 tonnes for the last ones, which at that time was sufficient for an express locomotive. The locomotives were not only used in flat areas, but also had to cope with gradients of up to 0.7 percent in the Palatinate Forest.

The Pfalzbahn began scrapping the first engines in 1891. The last one disappeared in 1896, when the considerably more modern P 2.I with the wheel arrangement 2-4-2 were already available. In 1925, the example was rebuilt with the name “Die Pfalz” and ten years later drove to the centenary of the German railways in Nuremberg.