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The bogies have a 600 mm diameter flat pivot, supported by a dancer crossmember, without suspension springs. The primary suspension consists of conjugate leaf springs, supplemented by helical springs.

DIESEL ENGINE (Fig. 3)
The diesel engine is a Baldwin 4-stroke, non-supercharged, in-line 6-cylinder engine with a 324 mm bore and 394 mm stroke, normally developing 750 hp at 625 rpm. This engine, along with the 8-cylinder type, has proven itself on many American switching locomotives.

Its power has been brought back to the nominal value of 660 hp. at the same speed of 625 rpm, it thus proves to be an extremely robust organ, its weight per horse being 19 kg, its power per liter of displacement 5 hp. its effective average pressure 5.6 kg/cm, its consumption 170 g of diesel per horsepower-hour.

The base and the cylinder frame are entirely arc-welded. The liners, of the wet type, are made of high-strength chrome-plated cast iron. Their strength means that they only need to be removed after five years of service; they are surrounded by a ring ensuring

uniform circulation of cooling water. The connecting rods, made of forged steel, are drilled to allow lubrication of the connecting rod foot and supply of the cooling device at the bottom of the pistons. The pistons, made of aluminum alloy, are fitted with five sealing segments and three scraper segments: the piston pins, of the floating type, are held by adjusted bolts. The cylinder heads, made of high-pressure cast iron

resistance, have two intake valves, two exhaust valves and a central injector. The distribution, of a classic type, is ensured by pressurized lubricated rocker arms. as well as the valve heads, and by push rods enclosed in a protective sheath. The camshaft, driven by chain, as well as the water and oil pumps,