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 On November 20th, China's first largest all-fiber steel crankshaft, which weighed about 5.375 tons, was about 6.735 meters long and had an installed power of 9000 kW, was off the assembly line of China South Locomotive Ziyang Company. The birth of the crankshaft "Big Mac" has filled the gap in the field of forging, heat treatment and machining in China's V-type 32/40 crankshaft, breaking the situation that China has long relied on importing this type of crankshaft. According to reports, CSR Ziyang's newly developed crankshaft can be widely used in large generator sets, marine main engines and auxiliary machines.