Start with what the GX-2 is: a Single-decker (Split level) coach with 2x 7.0L (281 ci) GM 6-71 I6 Diesel, from GMC. What it meant takes a little longer. The shape is credited to Albert Boca.
The story
The GX-2 (Greyhound Experimental #2 – The Scenicruiser) was a prototype bus built for Greyhound that was eventually developed into the Scenicruiser.
It began in mid-1948 as a 35-foot design, but, in part to accommodate more passengers, Greyhound President Orville Caesar directed his engineering department to add five feet in length to the upper deck of a PD-3751 obtained from GM. After Greyhound's initial experiences with GX-1, a 50-seat double-decked bus, Caesar decided that the next prototype would be a deck-and-a-half style, which led to the silhouette of the Scenicruiser.
What is underneath
The engine is 2x 7.0L (281 ci) GM 6-71 I6 Diesel; other versions carried different engines, listed in the specification table below. On the scales it comes to 26,100 -. Drive goes through a 1x 4-speed manual + 2-speed clutch. The wheelbase is NNN in. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Its place in the line
In the GMC line-up the GX-2 has a clear place: it replaced the Greyhound GX-1; it handed the line to the PD-4501 Scenicruiser; the factory was GMC Truck and Coach Division, Pontiac, Michigan.