Hello Bob ...if you were referring to the Deses diesels of Mexico ....here is a link to more info about them
https://ogrforum.ogaugerr.com/...in-mexico-in-the-50s
the Deses appears to be a lovely Die-Cast engine ...quite a step up from my lead door stops ...but they do sound great running..
Is there another Mexican manufacturer you were thinking of ?
Thank you
Cheers Carey