Not yet.....but, as the real Niagara was low on "details", a basic visual upgrade would not be enormously difficult. I would only aim at the bigger omissions - small piping under the running boards; steam and water piping along the firebox sides.
I did this Williams Niagara 20+ years ago. It was renumbered. I later added ERR Cruise Commander. Runs like butter, as they say. Weathering only; no extra details yet (one day....).
First order of business: paint those wheels and rods flat black. I used enamel and a brush. Then Dullcote the whole thing. Then I used some spray flat black held aloft. I forget what I used for the lighter running-gear/truck color. I would use dry pigments these days for the weathering, after the black rods treatment.
I have this and an MTH (w/ERR) and a Lionel Niagara. The Williams is the most sure-footed - helped by the sprung drivers (like the real ones) and a more "flexible" PT tender wheel design than the other two. I also added the later twin sealed-beam headlight "lens" (a purchased diesel detail item).