[not wanting to step on the restoration thread any more]
I love the narrow gauge and am glad #223 survived but it's selection for display has always puzzled me.
What I mean is, why were the people behind this so fixated on getting a narrow gauge engine that they settled for one with just about no relationship (most likely) to Utah and SLC when at the time they could have gotten a for real RGW std gauge engine that was only 6 years younger? D&RGW class C-26 #605 (RGW #116, 1889) certainly spent a lot of time running in Utah!
Also still around at the time were the last class of engines built to RGW order (delivered after the sale to D&RG) D&RGW 990-994 (RGW 700-704, Baldwin 1901) which would last until 1945-46 and also 20 C-48 engines originally lettered for RGW when delivered in 1906, 2 years before the consolidation of the D&RG system, but the C-48's probably weren't available in 1940. Still, any of those engines would have been more authentic to Utah than #223!
Hank