Ah, john, the dark side has become unjustifiably pricey these days. Just not worth doing another layout along with all the costly conversions from 3R.
Retail in this hobby has escalated past a reasonable limit.
As for the car, I prefer powders in many cases. Easy to control and applies well over the lettering too.
Upper areas of a box car generally are more affected by the suns UV and fades faster.
Mid to lower sides are often shaded by structures and other freight cars.
More grime down there too.
So the goal is to apply the faded color heavier near the top.
A quick coat of clear satin Krylon followed by dull cote will maintain the powder color.
A mist of flat black spray along the lower area is a quick way to show overall contrast.
Strait Dullcote eats powders, reducing the color and also tends to shrink decals.
Using a Mr. Clean magic eraser will allow logo and letter fading in under a few minutes.
Another way is to blast the shell using compressed air and baking soda into a cardboard box. Badger Mini blasters are available on the net.
Based on the modeling time frame you stated, your car sports the look.
I think your car would even stand out more with a lighter logo & lettering.
If you desire to experiment further, just take a fine brush with some mineral spirits and go over some of the white areas to achieve the contrast.
Paints, especially oils, have their purpose for certain things but can present a more bold appearance unless thinned out a bit.
These cars look great mixed in with the rest. I’m glad to have one.
It’s already getting a lot of run time along with the wagon top as well.
Just waiting on that Weaver MILW H. Rib now.
Thanks,
Steve