1947-1959: Alphabet Soup And Fleet Conformity

The late 1940's saw the end of many electrified route segments, and even though some of the newer All-Service Vehicles were converted to diesel-only operation, PSCT decided to standardize the look of the fleet by specifying General Motors buses for all future purchases. 1947 saw the final non-GM bus purchases with a group of Ford 79-B's and Brill C-44's. It also marked the beginning of PSCT's famous bus numbering scheme of one letter followed by three numbers, with the letter incrementing each year (but skipping to J in 1955, bypassing I). All like buses of a certain type were numbered in systematic fashion, with the 100's and 200's for small transits (the last of which were acquired in 1952), 300's and 400's for normal transits, 500's for deluxe buses, 600's for parlor buses (PD-4104's starting in 1953) and 700's for suburbans.

Notable of this group of buses is D900, a valiant but failed attempt to revive the ASV concept for use on the old Newark City Railway (paving over the tracks and running the buses above and underground). The plans never came to fruition. Thus, D900 never ran under wire in revenue and was later converted to a regular diesel bus, out of Greenville Garage. D900 was the only new bus on the roster in 1950, but fifteen used buses were acquired along with Ironbound Transportation Co.

Factory-installed air conditioning began appearing on 1958 deluxe and suburban buses; transit-class buses (the 300's) never were air-conditioned.