I built some diesel fuel rigs for O scale as they only offer them for smaller scales. They are modeled after this brand and there’s even drawings on the page:
http://www.snyderequip.com/104-hp-2-crane.html
here’s the original post if it’s allowed?
AWESOME Link!
I deal with these things all the time, the twin fuelpads at Harrisburg, the fuel rack at Enola, Cresson Enginehouse, and East Park at Conway all have these things.
I can’t see why they couldn’t be used for fuel oil for an oil-burning steamer, or for water for the tenders… well except for the MASSIVE amounts needed in those other cases.