A few years before the First World War, Jean-Baptiste Flamme developed a very powerful boiler that was to be installed in a goods and an express locomotive at the same time. In 1909 the type 36 with 2-10-0 wheel arrangement and in 1910 the Pacific of the type 10 were created. The boilers differed only in the firebox, which had enough space between the last driving axle and the trailing axle on the type 10, but had to be accommodated above the last two driving axles on the type 36.