MLW M-636

Locomotive

4 ft 8+1⁄2 in (1,435 mm) standard gaugeTrucksDofasco ZWT-3 Hi-Ad, ALCo Hi-AdWheel diameter40 in (1,000 mm)Length69 ft 10+1⁄2 in (21.30 m)Width10 ft (3.0 m)Height15 ft 3⁄4 in (4.59 m) (cab roof)Fuel typeDieselPrime moverAlco 16-251FRPM range300-1,100Engine typeV16 diesel engineAspirationTurbochargedAlternatorGE GTA11Traction motorsGE 752Cylinders16Train brakes26L

Performance figures
Power output	3,600 hp (2,700 kW)

The M-636 is a six-axle, 3,600 hp diesel locomotive marketed as part of the Montreal Locomotive Works six-axle "M-Line" series of locomotives. It was an evolution of the ALCo C636, and it saw many sales to Canadian, Mexican and Australian customers. Today, there are a handful M-636s left in revenue service.

Original owners

Units built by Montreal Locomotive Works^[1]
Railroad	Quantity	Road numbers	Notes
Canadian National Railway	40	2300–2339	Units were ordered without dynamic brakes.
Canadian Pacific Railway	44	4700–4743
Quebec Cartier Mining	11	71-76, 81-85
Ferrocarril del Pacífico	16	651-666
Units built by AE Goodwin^[2]^[3]^[4]
Railroad	Quantity	Road numbers	Notes
Cliffs Robe River Iron Associates	7	9410–9416
Hamersley Iron	19	4030-4048
Mount Newman Mining	16	5469–5484	All were built with ALCo Hi-Ad trucks.
Units built by Commonwealth Engineering
Railroad	Quantity	Road numbers	Notes
Cliffs Robe River Iron Associates	3	9421–9423	9423 was the last M636 built in February 1980.
Hamersley Iron	8	4049-4056
Mount Newman Mining	21	5485–5505	5485-5495 were built with ALCo Hi-Ad trucks. 5496 and up were built with the standard Dofasco ZWT-3 Hi-Ad trucks.
Total	185