I have to concur with all three members before me on this. Do not steam it, dust it off.
Linemar Atomic Steam Engines are rare, but not the rarest. In it's condition, it's the
rarest Linemar we have ever seen and that raises the bar on it. Plus you have the history
of it first hand. It has been in a time capsule long enough, display it in your home where
little fingers can't reach it and neither can direct sunlight. NIce.