T Gauge 1:450 Scale Code 40 Steel Rail 1 Pair R-402 | Toys & Hobbies, Model Railroads & Trains, Railroads & Trains | eBay!
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Apparently that's steel code 40, advertised for "T"scale use: 1/450. At a length of just 500mm, it's certainly not cheap, but it might be available in larger quantities which could cut the cost. Never hurts to ask.
Now here's the grey area, IMO, and not for your static model purposes, but more generally, for actual MRRing use on a layout or module. Does it...could it...conduct electricity to locomotives better (or just better enough) than does N/S? Enough so that it might substantially improve electrical conductivity so that...I'm dreaming I know...so that you might not have to clean track at all? Or much at all? Wouldn't that be nice?
It's not my money, but if I did try it myself, I'd also try some of the common lubricants we use just to see if they made it even better. Wahl's hair clipper oil, etc.
One other thing to keep in mind: "Like metals" wear both more quickly than do one soft metal vs. one harder metal, in which case the softer metal wears more easily. If I had to choose, I'd go for the softer metal--N/S for example--on locomotive or (other) wheels, rather than the other way round. It's gonna be much easier to replace some locomotive wheels than it is to replace 1000' of track.
So why even bother trying it? 'Cause it's fun to see what works and what doesn't particularly when thinking outside the box. At least IMO.