Powerpropulsion   Sturmvogel I see your TemplateInfobox ship beginUsage guide but I think it contradicts itself It says prime movers should be under power but a steam engine is a prime mover and that comes under propulsion  Its a combination of the boiler the pressure and saturation of the steam and the steam engine the type of expansion used the bore and throw of the cylinder and other factors that combine to produce the power generated  I think the guidance works better for modern ships than steam ships But Im happy to let your edit stand  Thanks for the interest