Here is another picture of the model, nose to tail with a converted Corgi model of the previous generation of GM buit Greyhound. You can see how much bigger the Scenicruiser is - and how much better its styling was. GM hit a home run there.
This bus is the ultimate for me is several ways. First, as I said above I considered it the ultimate bus when I was a kid. There were two vehicles I adored: the Scenicruiser and the Nash Metropolitan -- opposite ends of the vehicle spectrum!
Second, in my second 'Streets book, on bashing and scratch-building (its about 80% complete, the first is complete and with the published now), I have a whole chapter on making buses. This is the final example - fitting I think.
And third, this is among the most difficult and worrisome conversions I have ever done, even if it does not look like it should be. The difficultly was in get a smooth turning rear swivel truck with the wheels that close together (the outside edges of their flanges are with 1/2 mm of one another) - necessary the the right look and fit to the body. The swivel truck is made from the front axles of two K-Line step-vans - I used two of them as "donors" here - the early ones had larger diamter, "bus size" wheels and it took a whole day and a half to make it so that wheels and the two center pickups are worked smoothly and it swiveling without beinding of too much friction.
But the worry was because of the major problem: when in a D-16 curve, the wheelbase is so long that the front wheels of this bus are running at a 42 degree angle (!!) against the rails. The rear swivel truck neatly handles friction at that end - the wheels and their flanges run pretty parallel to the rails there. But in front, the wheels are fighting the curve at close to a 45 degree angle against the rails. And, the flange is so wide that it barely fits, half sideways, across the flange groove in the curve: at points it is actually touching both the rail and the back edge of the flange groove: friction is phenomenally high. This bus has about eight times the power and three times the traction of a normal 'Streets vehicle, and yet you will see it slow noticeably as it gets into a D-16 curve: it runs out of traction before power (always a good idea to arrange in a conversion, by the way). Still, it runs well through D-21 and on my country road, and it looks sooooo good.
The bus in the foreground is a 1954 GM Scenicruiser. General Motors manufactured the bus exclusively for Greyhound. Greyhound used this three-axle, monocoque, two-level coach from 1954 to the 1970s. 
