Sorry for necroing the old thread... but: the bus in Speed was a "Fishbowl", of which there were numerous variants... and in Canada, manufactured into the 80s - Canadian transit companies didn't like the look of the RTS that GM introduced in the late 70s (think the bus that span out in the beginning of Beverly Hills Cop), for which I don't blame them, that's one ugly bus. Busch put out a nice Fishbowl in HO not long ago. I'd say there would be three important models to make, in any scale: for the 40s and 50s, one of the Fageol Twin Coach models (to go with the GM Old Look Walthers is doing - I'd love a Fageol in N, the Sandwich Windsor & Amherstburg Rly had some in the late 40s, which is my period); for the 60s to 90s, the Fishbowl (and there's still a couple still in revenue service, in Gatineau, Qc); for the modern era, the New Flyer D40LF - these run all over the continent, and if the kit came with a choice of "backpacks" for the roof, a great many exact prototypes could be matched.