MLW M-420

Specifications
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo-Bo
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Trucks	Zero Weight-Transfer
Wheel diameter	40 in (1,016 mm)
Minimum curve	30°
Wheelbase	9 ft 4 in (2.8 m)
Length	61 ft (18.6 m)
Width	10 ft 4 in (3.1 m)
Height	15 ft 6 in (4.7 m)
Loco weight	272,000 lb (123,377 kg)
Fuel type	Diesel
Fuel capacity	2,500 US gal (9,464 L)
Lubricant cap.	216 US gal (818 L)
Coolant cap.	260 US gal (984 L)
Sandbox cap.	56 cu ft (2 m3)
Prime mover	ALCO 251C
RPM:
• RPM idle	450
• Maximum RPM	1050
Engine type	Four-stroke diesel
Aspiration	(1) Turbocharger
Displacement	10.95 L (668.2 cu in) per cylinder
Alternator	GE Exciter GY2P7
Generator	Main GE GTA17; Auxiliary GE 553 GY27
Traction motors	(4) GE 572
Cylinders	12, V-arrangement
Cylinder size	Bore x Stroke 9 in × 10.5 in (229 mm × 267 mm)
Transmission	Diesel-electric
Gear ratio	74:18
MU working	Yes

Type and origin
Type and origin
Power type	Diesel-electric
Builder	Montreal Locomotive Works
Build date	May 1973 - February 1977; July 1980 - August 1981
Total produced	112 A-units; 8 B-units M-420; 72 M-424

MLW M-420, M-424
MLW M-420, M-424
	M420 #3569 of St Lawrence & Atlantic Railroad
Power type
Type and origin
Power type	Diesel-electric
Builder	Montreal Locomotive Works
Build date	May 1973 - February 1977; July 1980 - August 1981
Total produced	112 A-units; 8 B-units M-420; 72 M-424
Configuration:;
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo-Bo
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Trucks	Zero Weight-Transfer
Wheel diameter	40 in (1,016 mm)
Minimum curve	30°
Wheelbase	9 ft 4 in (2.8 m)
Length	61 ft (18.6 m)
Width	10 ft 4 in (3.1 m)
Height	15 ft 6 in (4.7 m)
Loco weight	272,000 lb (123,377 kg)
Fuel type	Diesel
Fuel capacity	2,500 US gal (9,464 L)
Lubricant cap.	216 US gal (818 L)
Coolant cap.	260 US gal (984 L)
Sandbox cap.	56 cu ft (2 m3)
Prime mover	ALCO 251C
RPM:
• RPM idle	450
• Maximum RPM	1050
Engine type	Four-stroke diesel
Aspiration	(1) Turbocharger
Displacement	10.95 L (668.2 cu in) per cylinder
Alternator	GE Exciter GY2P7
Generator	Main GE GTA17; Auxiliary GE 553 GY27
Traction motors	(4) GE 572
Cylinders	12, V-arrangement
Cylinder size	Bore x Stroke 9 in × 10.5 in (229 mm × 267 mm)
Transmission	Diesel-electric
Gear ratio	74:18
MU working	Yes
Maximum speed
Performance figures
Maximum speed	67 mph (108 km/h)
Power output	2,400 hp (1,790 kW)
Tractive effort:;
• Starting	60,400 lbf (268.67 kN)
• Continuous	35,000 lbf (155.69 kN)
Locale
Career
Locale	North America,; Venezuela
	Main Technical Reference

The MLW M-420 was a diesel-electric locomotive manufactured between 1973 and 1977 in Montreal, Canada by the Montreal Locomotive Works. A total of 90 units were built for Canadian railways, including eight B units built for the British Columbia Railway; most of production went to Canadian National. Only seven units were sold outside of Canada, to the State Railways Institution in Venezuela and the Providence and Worcester Railroad in the United States.

The M-420 was one of the first locomotive models (along with the EMD GP38-2) to use the wide-nosed Canadian comfort cab, pioneered by Canadian National. By the early 1990s, variations on this cab design had become the standard of the industry. As with wide-nosed General Motors Diesel units from the same period, references to the model commonly add a "W" at the end of the model name, but it is not part of the official model designation. Most M-420 units rode on MLW ZWT (Zero Weight-Transfer) trucks.