Split-Shaft arrangement is commonly used for which propulsion purpose on ships?

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Split-shaft propulsion is about using two separate propeller shafts driven by independent power sources to provide thrust. This setup is chosen for main propulsion because it adds redundancy: if one engine or shaft fails, the other can continue to drive a propeller, helping the vessel keep moving. It also improves maneuverability and allows maintenance on one shaft while still maintaining propulsion on the other. Auxiliary power, electrical generation, and fuel transfer use different systems and do not rely on two propulsion shafts.