Some beauties there Rich!
Triple expansion engine clearly visible in S.L. Aurelia

+1. I think I have typed previously of an acquaintance who used a Transit van wheel mounted in his back garden to bend the pipes round to create the boiler tubes for the steam engine he was making in his shed for his vessel named Orca, which he kept at Kip marina on the Clyde... A really talented chap, sadly missed.
I think the city of Glasgow sewerage/sludge vessels, Dalmarnock and Shieldhall were both triple expansion steam boiler equipped, they used to take organised groups such as clubs and pensioner parties on a day trip, "doon the water," when carrying out their sludge dumps in the Clyde estuary off the isle of Arran. The "passengers" where treated to lunch while the vessels took a wide turn while disposing of their cargo, just South of the measured mile.... I well remember the day I got my timing wrong and sailed through it...while heading for Campbeltown...!