The MLW RS-23 was a 1,000 hp (746 kW) diesel-electric locomotive built by Montreal Locomotive Works between August 1959 and September 1960. Production totaled 40 locomotives.

MLW RS-23
GWWD 202 in Winnipeg on March 21, 2019.
Type and origin Power type Diesel-electric Builder Montreal Locomotive Works Model RS-23 Build date August 1959 to September 1960 Total produced 40
Specifications Configuration: ​  • AAR B-B  • UIC Bo'Bo' Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover Alco 251D RPM range 1025 / 325 Engine type Four-stroke diesel Generator DC generator Traction motors 4 x GE 752 DC traction motors Transmission Electric Loco brake Air, optional dynamic Train brakes Air
Performance figures Power output 1,000 hp (750 kW)
Career Locale Canada and United States

The largest fleet of these locomotives was operated by Canadian Pacific Railway, which classed them DRS-10c in that company's locomotive classification system.