RS-3 Diesel Locomotive

Prototype Information

The ALCO RS-3 rolled out in 1950 as a versatile road-switcher, building on the success of ALCO’s earlier RS-1 and RS-2 models. With a 1,600-horsepower 12-cylinder 244 diesel engine, it offered the power and flexibility to handle both freight and passenger service on light and mainline tracks.

Railroads appreciated the RS-3 for its reliability, rugged construction, and ease of maintenance. It became a common sight across North America, serving short lines and major carriers alike. Many units stayed in service well into the 1970s, and some even found second lives in industrial and tourist operations.

The RS-3 helped cement ALCO’s reputation as a key player in the diesel transition era, offering a practical alternative to EMD’s popular GP-series locomotives.