What a fabulous machine!. I am glad you mentioned it is a compound, that explains the cylinder above and to the left of the valve. I see rather than one or two lubricators several smaller ones are located along the running board. The side rods are so very light thus the counterweights are near non-existent. This would be one of the advantages of the four cylinder design. Excellent photo. Thank you Georg.
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In this photo, the casings of the left high-pressure cylinder and the slide valve have been removed. In front of the cylinder, the slide of the left low-pressure cylinder can be seen, which is located to the left of it as seen from here. The piston protection tubes of the two low-pressure cylinders are visible above the buffer plank. The locomotives had a four-cylinder compound engine of the De Glehn type with separately adjustable Heusinger controls for the high-pressure and low-pressure engines, as was usual in France for high-performance locomotives. The inner cylinders (LP cylinders) operate on the cranked first coupling axis, the outer cylinders (HP cylinders) on the second. A slide valve made it possible to feed high-pressure steam to the low-pressure cylinders during startup or when large amounts of power were required.
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