Hello,
When I saw the color on the Superior trailer my mind immediately recalled the old "Dark Teal" color that was popular with Sears-Roebuck back in the '60s and '70s:
https://www.worthpoint.com/worthopedia/ertl-sears-1970s-transtar-truck-1794709468
To my eye it is a bit darker and perhaps a touch of blue added to the Microscale recommendation of "Jade" green (AKA Century green to the New York Central).
Century_green by Edmund, on Flickr
Microscale does a great job with their research but I have found some of their documentation, and they admit this, as simply a starting point or suggestion.
Century_green_RBL by Edmund, on Flickr
I can't say my lighting or camera white balance is perfect but IMHO the Jade/Century green seems to be a bit on the light side. IF you use it as a starting point I would plan on adding a drop or two of dark gray and perhaps a drop of blue to your mix.
HOWEVER (there's always a however):
Take a look at this photo (the paint may be sun-bleached and faded)
https://www.flickr.com/photos/rwmods/14047423983/in/photolist-PBNKdG-oGFMUC-rwB48b-npjHKe
That almost looks like sky blue, or Robin's egg blue?
Good Luck, Ed