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 rarely used beyond Polgahawela on the main line (only with assistance from a dynamic brakes equipped locomotive on downhill), and are not used beyond Nawalapitiya. 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
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
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