Electromotive Corporation supplied the 600 hp (450 kW), eight-cylinder Winton 8-201A prime mover and electric transmission components, though unit 2028 would be rebuilt in 1948 with a more modern EMD 567 prime mover.

The units had a B-2 wheel arrangement, mounted atop a pair of road trucks.

The aft section was divided into two separate compartments: one was used to transport baggage and the other served as a small railway post office, or RPO (the forward door, located just behind the radiator louvers, was equipped with a mail hook).

Two units were manufactured for the Seaboard Air Line Railroad (SAL) and were numbered 2027 and 2028.

Unit 2027 was destroyed in a collision with a gas tanker truck at Arcadia, Florida in 1956.