What are GEVO's?

I have heard of GEVO’s in reference to locomotives. What does it mean or stand for?

http://www.google.com/search?hl=no&q=GEVO+wikipedia+engine&meta=

http://en.wikipedia.org/wiki/List_of_U.S._railfan_jargon

Smile,
Stein

Thanks. I thought thats what GEVO stood for, but I wanted to be sure.

Weren’t they an 80’s new-wave band that wore flower pots on their heads…?[:P]