In addition to triple expansion crankshaft there looks to be the cylinder casting for the same engine. From larger to smaller diameters being HP, IP, and LP. The shaft in foreground looks like a section of the propeller shaft incorporating multi-collar thrust arrangement. This was an early method of absorbing propeller and engine thrust and was superceded by the Michell single collar thrust block which a has tilting white metal clad pads supporting an oil film. A design still in use today.