Finally found decals small enough for my Z-scale Mikado. Now it is in NYC to match all of my other (5) steamers.
Maybe I can use it as a miniature railroad on my miniature railroad!
Believe it or not, inoperative as this is, it still cost $50. I though that was pricey. So it seems both G and Z have the edge on O price-wise.
And I must say after comparing all scales that O seems optimal for this old guy.