If you use the ruler in Surveyor, you can change the units of measurement from Imperial (or metric), to a selection of your choice from a list of several various modelling scales.
 
It doesn’t alter the size or looks of the layout or baseboard/s, but it does allow you to measure distances to the model scale chosen. It works pretty well for longish distances, but won’t be very helpful for, e.g. measuring a shed, because the values shown only go to one decimal place.
 
Here I’ve shown a shed measured in metric, and the n-scale measurement which appears after the scaling has been changed. (The result circled in yellow is pasted over the first image for illustrative purposes only. You can’t get both showing in Surveyor at the same time).
 
		
		
	
	
 
I can’t see much use for it for what I do. Like Ray, I enjoy the unlimited potential af a very large route. 
However, it could be useful for someone who wants to re-create their current physical, or childhood memory, mini-scale model in Trainz. (I've built the HO scale layout which used to be in my bedroom sixty years ago!)
 
The scales can be changed on my version in 
Surveyor Menu>Edit Route>Working Scale
 
The choices are:
- Real scale
- S scale
- TT Scale
- Z Scale
- #1 Scale
- 1/2 Scale
- G Scale
- HO Scale
- N Scale
- O Scale
- OO Scale
Cheers
Casper