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MmmmYou’re the Math Whiz on the TeamWhat does 10 lbs come out to in N scale?Lol

160 x 10 = 1600 lbs, less than a ton.

All our models are reduced in all 3 dimensions

Is there an N scale PRR blend?

I don't think they have a specific blend labelled for PRR. You should contact Dale (info above) and ask him what he would suggest. I think Penn-Ohio would be plausible.I hesitate to wade into the scaling discussion, but I will... When we model, we scale the 3 macroscopic dimensions of space, and sometimes the 1 macroscopic dimension of time (with a different scale factor). We do not scale the density of our modelling materials, so the weight of any model scales as S^3, where S is the model scale, e.g. 1/160. Assuming N scale ballast has about the same density as prototype ballast* 10 lbs of it would correspond to 20,480 tons of prototype ballast.* Dale told me that 10 lbs of #50 Penn-Ohio is about 1 gallon, or 0.13 cu.ft. This gives a density of ~75 lbs/cu.ft. -- not too different from NP's rule of thumb for the prototype.

So what do you get if you scale-up N scale WS dyed walnut shell ballast to 160:1?

Two photos comparing WS "fine" with S&S #50: