Sri Lanka Railways M4

The Sri Lanka Railways M4 is a class of diesel-electric locomotive manufactured in Canada by Montreal Locomotive Works. Fourteen of the manufacturers' model MX-620 were imported in 1975.

Sri Lanka Railways M4
Class M4 No. 755 Mahaweli
Type and origin
Power typeDiesel-electric
BuilderMontreal Locomotive Works
Order numberM-6080
Serial numberM-6080-01 to M-6080-14
Build date1975 onwards
Total produced14
Gauge5 ft 6 in (1,676 mm)
WheelbaseBogie: 11 ft 2 in (3,404 mm)
Length58 ft 3 in (17.75 m)
Loco weight93 long tons (94 t; 104 short tons)
Fuel typeDiesel
Prime moverALCO 251C3
Engine type4 stroke V12 diesel
Loco brakeAir, Vacuum, Dynamic (Some vary)
Performance figures
Maximum speedDesign: 104 km/h (65 mph)
Service: 65 km/h (40 mph)
Power output1,750 hp (1,300 kW)
OperatorsSri Lanka Railways
Number in class14
Official nameSee table
First run1975

This was the longest locomotive in the Sri Lanka Railways previously. All units are still operational. On regular operation they are not used beyond Polgahawela on the main line, and are not used on the hill country section. They used to travel on the full main line regularly until the previous decade.

They are painted in a livery of dark blue, light blue, silver with yellow striping; although No. 752 Point Pedro was painted in a special ICE (Intercity Express) livery.


Number Name Notes
743 Madhu Air Brakes Added
744 Sigiri Air Brakes Added
745 Ruwanweli Air Brakes Added
746 Namunukula Air Brakes Added
747 Kelani Air Brakes Added
748 Walawe Air Brakes Added
749 Dunhinda Air Brakes Added
750 Isurumuni Air Brakes Added
751 Diyaluma Air Brakes Added
752 Point Pedro Special ICE livery was on this locomotive. Now normal livery.
753 Samanala Imported with Dyn Brakes. Air Brakes Added
754 Menik Imported with Dyn Brakes. Air Brakes Added
755 Mahaweli Imported with Dyn Brakes. Air Brakes Added
756 Laxapana Imported with Dyn Brakes. Air Brakes Added


  • "Class M4 Locomotive".
  • Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continenetal Railway Circle. ISBN 0-9521655-1-1.
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