That looks to me like one of the models offered by Durango Press?
https://jlinnovative.com/catalog/index.php?manufacturers_id=4&sort=4d
The example in the photo looks like it may be a scratch/kit-bash, though.
Good Luck, Ed
... the crane pictured on page 25 of the July '23 Model Railroader, in the article titled "A work car and much more". I've seen pics of it before, so I'm pretty sure its a production model. My roundhouse chief insists that he needs one.
Jim