NKP guy
No, it was a gen-u-ine diesel locomotive of the art deco period and from Out West.
This is beginning to get more interesting. None of the UP 'bulbous-nose' cars were locomotives; they were parts of articulated trains. Same for the tomato worm. By the time you get to anything that would be 'separable' as a locomotive it would be the City of Denver style -- and that would be memorable in a completely different way.
I don't suppose on reflection you remember the size, or the number of trucks, or other detail about it? I'm still thinking 'advertising replica' rather than actual, functioning locomotive equipment...
