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Sri Lanka Railways M4
Type and origin Power type Diesel-electric Builder Montreal Locomotive Works Order number M-6080 Serial number M-6080-01 to M-6080-14 Model MX-620 Build date 1975 onwards Total produced 14
Specifications Configuration: ​  • UIC Co′Co′ Gauge 5 ft 6 in (1,676 mm) Wheelbase Bogie: 11 ft 2 in (3,404 mm) Length 58 ft 3 in (17.75 m) Loco weight 93 long tons (94 t; 104 short tons) Fuel type Diesel Prime mover ALCO 251C3 Engine type 4 stroke V12 diesel Cylinders 12 Loco brake Air, Vacuum, Dynamic (Some vary)
Performance figures Maximum speed Design: 104 km/h (65 mph) Service: 65 km/h (40 mph) Power output 1,750 hp (1,300 kW)
Career Operators Sri Lanka Railways Class M4 Number in class 14 Numbers 743–756 Official name See table First run 1975

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.

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.

Fleet

Gallery

• 
• 
• 
• Class M4 No. 745 "Ruwanveli"
• Class M4 No. 747 "Kalani"
• Class M4 No. 748 "Walawe"
• M4 No. 749 "Dunhida"
• Class M4 No. 754 "Menik"
• Class M4 No. 755 "Mahaweli"
• Class M4 No. 756 "Laxapana"

References

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

v t e Locomotives and railcars of Sri Lanka
Steam locomotives	A1 A2 A3 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 C1 D1 D2 D3 E1 F1 F2 F3 H1^ J1^ J2^ K1^ L1^
Diesel-electric locomotives	G1 G2 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
Diesel-hydraulic locomotives	P1^ N1^ N2^ W1 W2 W3 Y Y1
Steam railcars	R1 R2 R3 R4 V1^ V2^
Diesel railcars	T1
Diesel multiple units	S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14
^ indicates narrow (2 ft 6 in / 762 mm) gauge stock

• Diesel–electric locomotives of Sri Lanka
• MLW locomotives
• Co-Co locomotives
• Railway locomotives introduced in 1975
• 5 ft 6 in gauge locomotives