Some six-coupled freight locomotives, built between 1868 and 1879 a total of 305 times, were called C III by the Bavarian State Railways. A distinction can be made between three slightly different types, of which the standard type made up the largest part with 239 locomotives.
The oldest variant included 52 locomotives, which the Bavarian Eastern Railway procured in five series from 1867. It was based on the type C, but had a larger-diameter boiler and more grate and heating area to increase power. They came into the stock of the state railway after the takeover of the Eastern Railway in 1876 and were slightly lighter than their sisters.
The standard type was created from the C II of the state railway and was produced from 1868. In contrast to its predecessor, it was driven on the middle axle instead of on the last one. The valve gear was still inside, but was now of the Allan design. The locomotive frame was on the outside, so the power was transmitted via Hall cranks. From the third batch of 1876, a larger boiler and larger cylinders were installed. The first two batches were later adapted to the later batch.
In the years 1872 to 1874, 14 more were added, which were originally built by Sigl in Vienna for Hungary with larger tenders and were not accepted. The dimensions of the locomotives themselves were almost identical to the rest of the machines, especially after the installation of a new boiler with the same dimensions.
The last locomotives of all variants survived until after the First World War and some were included in the Reichsbahn's provisional renumbering plan as class 5378, but were retired by 1925.