It results as from 1902 that De Glehn will impose " its " engine with the series A17, it also from Ivc Badoise with a boiler a little larger and wheels of 1m85. The dome is advanced on the first ring; the pipes of vapor arrival to the cylinders HP outsides pass behind this one; the cylinders LP, placed with the top of the bogie, oblige the recourse to a frame and axle boxes external with the wheels. A certain tendency to the derailment in the small rays characterizes the bogie, still called Alsatian, and explains the presence of jacks with screw and pawls fixed on the aprons of the whole of the machines while being equipped. A total of 50 units is affected with the EL in 1902 and 1903 to be classified successively in S4 then P7, i.e. that engines speed in the beginning, they are relèguées with the slow trains. After a three years pause, the production of another significant series is committed in 1906 to be completed in 1909: it is S9, provided by Graffenstaden and Henschel. In spite of its apparent homogeneity, differences in significant dimensions in the engine and the boiler betray some hesitations in the design, not making it possible to have a unified series.