Sri Lanka Railways M7

Class M7 is a type of diesel-electric locomotive built for Sri Lanka Railways by Brush Traction, UK, and imported in 1981. This locomotive has the shortest length, least power and least weight compared to other diesel locomotives of Sri Lanka.[1]

Sri Lanka Railways Class M7
Class M7 Locomotive
Type and origin
Power typeDiesel
BuilderBrush Traction
Build date1981
Total produced16
Gauge1,676 mm (5 ft 6 in)
Length12.8 m (41 ft 11 78 in)
Loco weight66 tons
Prime moverGM 8-645E
Engine typeV8 2 stroke diesel
Performance figures
Maximum speed80 km/h (50 mph)
Power output994 hp (741 kW)
OperatorsSri Lanka Railways
Number in class16
Numbers799 ~ 814
DispositionActive, except N0. 803
N0. 803 was condemned


Three locomotives (803, 813, 814) were painted in a special color scheme and later was painted in normal livery.

In 1999 M7 locomotive No. 803 met with an accident and was seriously damaged. 803 is a non runner,


This locomotive was introduced as a shunter by the manufacturer, Brush Traction. In Sri Lanka, these are mostly used in short passenger services. M7s are not permitted on the Main Line because of the low power and lack of dynamic braking but it can be run on all the other of the railway lines in Sri Lanka including the Kelani Valley Line.


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