GMC PD-3571

Per Bus World Encyclopedia of Buses (1988):

When Greyhound plans for a revolutionary postwar bus design did not materialize, 2,000 buses of the familiar prewar Silversides pattern were ordered from General Motors and delivered in 1947 and 1948 to replace older buses exhausted by World War II.

The classic Silversides, known for the aluminum fluted siding, formed the first large fleet of diesel-powered buses. They incorporated some mechanical improvements over the prewar buses but were quite similar in appearance. The majority were the 37-passenger model PD-3751 of which 1,643 were produced and the remainder were the 41-passenger PD-4151 of which there were 357. All were delivered to Greyhound companies or affiliates.