RailServe Leaf Gen-set Locomotives

This forum has been pretty quiet - perhaps the rebuilder market has been pretty quiet in the real world too.

Anyway, a targeted banner ad started following me around today as I browsed various non-railroad site (e.g. Politico) - the ad was for RailServe Leaf Locomotives - clicking led to this website.
Some points:
"The Railserve LEAF Gen-Set locomotive has been in service since 2008"
- It has - under what brand name? I don't recall reading about it before.
"The LEAF uses a Cummins engine that meets EPA Tier III emissions standards"
- OK
"One-button push start eliminates up to 30 minutes of startup preparation"
- Cool - but do most modern-era locomotives require 30 minutes of prep before start-up?
"Maximized tractive effort at speeds less than 10mph"
- Ugh - this seems optimized for excepted track service...or...
"Built for industrial in-plant and commercial yard applications"
- So, no short-line road service it seems, or at least they are not promoting such usage

Going to the photo-gallery, it seems clear these are rebuilt, with the post-1990 switcher standard format of low nose and long hood (well, low hoods I guess). The second set of images down seem to me to be a modified GP30. Is the third set of images down a rebuilt GP9 (round cab roof?)

Hey, you can register for a free test ride on a RailServe Leaf! Possibly you need to supply your own railroad, I dunno.

The site also notes that RailServe is a member of the Marmon Group, a Berkshire Hathaway company. Perhaps we ought to be looking for examples in use at BH industrial sites, but I've never seen one before.

The three locomotives shown in the photos all have different cabs: at a guess, Railserve uses the original cab from the unit to be rebuilt. 3016, the one in the middle row, has an unmistakable GP-30 cab, looking even weirder than normal because the long hood behind it is so much lower than the cab roof.

(As they say in the model railroading community, there's a prototype for everything! I can imagine a modeler building a model of this, waiting for guffaws of "That's TOTALLY implausible," and then pulling out the photos.)