> This is kind of absurd, I have been on busses all over the country, a metro bus, is a metro bus. There are not really differences based on topography or climate.
Hmm, not sure about that. I live in Dublin, which is, generally, very flat, and where the temperature rarely goes far outside the 0 to 20 degrees C range. The buses can be fairly unpleasant on rare very hot days (no air conditioning), the electric ones can be unpleasantly cold on rare extremely cold days (heating not specced for it; this isn't an issue for the diesel ones as those produce so much waste heat anyway), and when I was a kid I lived in one of the few hilly parts of Dublin, and bus breakdowns going uphill were somewhat common (in fairness I think this is less of a thing now). Geography absolutely matters; Dublin's buses would be basically unusable anywhere very hot or cold.
There's other stuff, too. Buses here are almost always double-decker, but one specific new bus route requires single-decker buses, because the double-deckers won't fit under some of the older railway bridges. This will also require modifications to some road infra, which won't currently take long buses (to have a decent capacity single-deckers need to be longer; the single-deckers will be about 13m long vs 11m for the normal buses). Some cities use articulated buses; those wouldn't work here at all.