The GMC PD-4501 Scenicruiser
, manufactured exclusively for Greyhound Lines
, was a three-axle monocoque
used by Greyhound from 1954 to the 1970s. It was introduced in July 1954, and in total, 1001 were made between 1954 to 1956.
Due to its ubiquity in US cities and along highways
in the late 1950s and the 1960s, the Scenicruiser became something of an icon
of the American way of life
of those years.
The high-level design concept of Scenicruiser may have been inspired by the passenger-carrying railroads
of the United States
and their popular dome cars
; however, this type of two-level body in motorcoachs was common already in the late forties
in Western Europe
, including Great Britain
where it was known as Observation coach
. Actually the concept of two-level monocoque body was already present in the Spanish Pegaso Z-403
two-axle coach, designed in 1949 and in production since 1951.
The PD-4501, the most distinctive American parlor
bus design of the modern era, was the result of five years of GM Truck and Coach Division effort based on a design by Raymond Loewy
as . The design is listed under the with Roland E. Gegoux as its designer. Originally conceived as a bus, Greyhound used a tandem-axle, prototype called the GX-2 to successfully lobby for the lifting of restrictions against operation of buses.
Power was originally provided by two GM Detroit Diesel
4-71 engines driving through a fluid coupling because the 8V71 engine was not ready... Read More