Sri Lanka Railways M8

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Class M8
SLR M8 Loco.jpg
Class M8 No. 846
Type and origin
Power type Diesel
Builder Diesel Locomotive Works
Model M8 (WDM-2), M8A(?)
Build date 1995 onwards
Total produced M8(8), M8A (2)
 • UIC Co'Co'
Gauge 1,676 mm (5 ft 6 in)
Wheel diameter 1,092 mm (3 ft 7 in)
Wheelbase 12.834 m (42 ft 1 14 in)
Length 17.12 m (56 ft 2 in)
Width 2.864 m (9 ft 4 34 in)
Height 4.185 m (13 ft 8 34 in)
Axle load 18,800 kg (41,400 lb)
Loco weight 112,800 kg (248,700 lb)
Fuel capacity 5,000 l (1,100 imp gal; 1,300 US gal)
Prime mover ALCO 251-B
RPM range 400 - 1000 rpm
Engine type M8 V16 diesel
M8A V12 diesel
Aspiration Turbo-supercharged
Cylinders M8 (16), M8A (12)
Cylinder size M8 228 mm × 266 mm (8.98 in × 10.47 in)
Train brakes Air, Vacuum
Performance figures
Maximum speed 120 km/h (75 mph)
Power output M8(2,800 hp (2,100 kW))
M8A(2,200 hp (1,600 kW))
Factor of adh. 0.27
Operators Sri Lanka Railways
Numbers M8 (841-848), M8A(877,878)[1]
Locale Sri Lanka
Delivered M8 (1996), M8A (2001)
Current owner Sri Lanka Railways
Disposition active

Sri Lanka Railways Class M8 is a class of Sri Lankan diesel-electric locomotive that was developed by Diesel Locomotive Works at Varanasi, India,[2] in 1996. This class of locomotives was fitted with 2,800 hp (2,100 kW) V16 power units. This is used on both passenger and freight trains on Sri Lanka Railways. Currently[when?] this is the most powerful locomotive in Sri Lanka.[1]


This locomotive is capable of hauling 20 carriages at once but usually not used to haul more than 18 carriages. Major problems that are seen in this class are maintenance difficulties and corrosion.[1]

Sub classes[edit]


Left:Class M8A, Right:Class M8

Two (877 & 878) short truck M8A locomotives were delivered in 2001. They were imported to use on Up country main line, but it was impossible to run them due to their wheel design[clarification needed]. M8A locomotives were built using 2,200 hp (1,600 kW) V12 power units.

Current operation[edit]

M8 and M8A are not used on the Main Line above Navalapitiya and on the Kelani Valley Line but are operated on other lines. This locomotive is used when it need to pull much heavy load. Mainly used in flat lines like Northern Line, Trincomalee Line, Batticaloa Line and Coastal Line.

Depot for the M8s is Diesel Electric Locomotive Shed at Maradana.

Accidents and incidents[edit]

See also[edit]

Notes and references[edit]

  1. ^ a b c "Class M8". Sri Lanka Railways Info Page. Retrieved 22 August 2014. 
  2. ^ "Mainline Diesel-Electrics". Model Railroad Club of Sri Lanka. Retrieved 22 August 2014. 

External links[edit]