Thanks guys,

I believe I found my answer in Loco Bill's response:  He says Bachmann does build both 1:22.5 and 1:20.3 scale.  That was my question!

Thanks for your answer...

A scale of 1:22.4 would seem a more logical choice to accurately model 1 meter gauge, but then, oh well.  So, Bachmann switched from 1:22.5 to 1:20.3 scale sometime after entering the large scale market.  I'm thinking that since the Big Hauler series is not actually modeling any specific prototype, that it would probably be acceptable to refer to it as either scale, depending on individual preference or bias.  In other words, a difference of a few scale inches wouldn't be significant; as a figure 3-1/4" tall would represent a person of 5'6" in one scale and 6'1" in the other; or a 2" diameter drive wheel would vary from 41" to 45" between the scales.   

Is this logical, or does Bachmann actually design each product line to a different scale?

The Big Hauler products seem to be described as 1:22.5 scale, where the Spectrum line is billed as 1:20.3.  Is there a real reason for this?  Both products appear to be meant to depict 3 foot narrow gauge railroad lines, which when modeled in 45 mm track scale to 1:20.3.  The 1:22.5 scale with 45 mm track is a gauge of just under 40 inches. 

Is there a reason for this other than to create a distinction between product lines?