You know, it could just be TRS2006 nostalgia talking, but I still love the Marias Pass route, even if the current version is a bit dated by modern Trainz standards (and some of the session scripts are broken in TRS22).
To say I'm beyond hyped for the new version the guys are cooking up is an understatement.
Then why even say anything at all? GILA is a desert route and probably has a total of 2 trees, so the comment makes zero sense in context with the screenshot