Sharing a cab with its predecessor, the R-series marked the introduction of four-wheel drive vehicles and the wider use of diesel engines.

Ranging from light-duty pickup trucks to tandem-axle semitractors, the series was produced across a wide variety of applications and design configurations.

Heavy-duty vehicles remained in production into the 1960s (under multiple model designations), ultimately replaced in 1972 by the Paystar line.

Priced $60 less than the R-110, the new model line received different brakes and suspension tuning; the SD-220 was retuned for 104 hp output.

In 1965, the construction trucks dropped a letter prefix, becoming the 210/230 series; the model line was produced through 1972, when it was replaced by the Paystar.

The model line also included the Schoolmaster bus chassis, Travelall wagon, and Metro delivery van.

Distinguished by a redesign to the front fascia, the S-series marked the introduction of four-wheel drive to light-duty vehicles.

During 1957, the S-series was replaced by the completely new A-series, forming the basis for International light trucks through 1968.