I've drawn several buses so a smaller scale than standard to fit in with the North Americna Renewal Set and the Canadian and US tran sets. I'll post in-progress images soon, but for now, the plan is to include North American style road vehicles from horse wagons up to future semi trucks.
I've got the majority of the buses actually drawn, and trucks are a WIP.
Basic overview of what I've got in mind.
Buses:
Several buses, early buses are generic (not separated into coach and urban), several urban transit buses as well as highway coaches (including the GMC Scenicruiser

Trucks:
Semi trucks, standard trucks as well as trucks with pup trailers for all cargoes, ranging from model T's to futuristic semis
Horse Wagons
Horse wagons, available from 1800
Streetcars:
From a horse drawn streetcar in 1830 to future articulated trams
Will post a tracking table soon, as well as current in-progress graphics.