"Isn't there any historic value or another use for these tanks rather that to be cut up and melted down?"
Most tanks are in such a worse condition that there are more rust hols in than rivet holes. Could you imagine how many parts on # 463 or any other are original?? I guess only the bouilder plates, frame, some driver centers and perhaps the bell.
"Could the tanks be of any value as future water car set asside for emergencies?"
Would be cheaper to weld a new tank or regauge an older s g tank car instead of repairing the older
tanks
"Could the tanks be auctioned off to someone who wants to buy part of the narrow gauge?"
What the heck should someone do with that tender ?? Wait until the other parts of the engine have to be replaced to . Thern maybe in 150 -200 years he got the complete pile of junk.
"Can it be of advertising value to a motel or park display as a tank alone?"
Flowerpot?, sandbox for children ?, jacuzzi ?
Could they be of value to advertise the railroad on a road display?
Maybe the only choice but they must be kept in good shape
"These question are without knowing of the actual rusted condition of the tanks, but I sure would like to buy the Flying Rio Grande name from the part of the side sheet, or the number off the end sheet."
My two cents
Steffen