Keretapi Tanah Melayu class 22

The KTM Class 22 is a class of mainline diesel electric locomotives designed and equipped by English Electric-AEI Traction, with construction by Metro-Cammell, for operations by Keretapi Tanah Melayu, Malayan Railways, of Malaysia.

Keretapi Tanah Melayu class 22
Type and origin
Power typeDiesel-electric
BuilderEnglish Electric-AEI Traction, in association with Metro-Cammell,
Build date1971
Total produced40
Specifications
Configuration:
​
 • CommonwealthCo-Co
Gauge1,000 mm (3 ft 3 3⁄8 in)
BogiesEnglish Electric bolsterless low weight transfer
Wheel diameter3 ft 2 in (0.965 m)
Wheelbase11 ft 8 in (3.556 m) bogie
Length48 ft (14.630 m) over headstocks
Width9 ft 0 1⁄2 in (2.756 m)
Height12 ft 7 in (3.835 m)
Axle load14 long tons (14.2 t; 15.7 short tons)
Loco weight82 1⁄2 long tons (83.8 t; 92.4 short tons)
Fuel typeDiesel
Fuel capacity800 imp gal (3,600 L)
Sandbox cap.560 lb (250 kg)
Prime moverEnglish Electric 8CSVT Mk III
Engine RPM:
 • RPM idle		450rpm
 • Maximum RPM900 rpm
Engine typefour stroke, four valves per cylinder
Aspirationturbocharged, intercooled
GeneratorEE822/16J
Traction motorsAEI-253
Cylinders8 Vee
Cylinder size10 in × 12 in (254 mm × 305 mm)
MU workingnot fitted
Loco brakeAir, proportional control, dynamic
Train brakesVacuum
Performance figures
Maximum speed60 miles per hour (97 km/h)
Power output1,710 hp (1,280 kW) gross, 1,500 hp (1,120 kW) net
Tractive effort:
​
 • Starting58,300 lbf (259.3 kN)
 • Continuous40,300 lbf (179.3 kN) at 12 miles per hour (19 km/h)
Career
OperatorsKeretapi Tanah Melayu
Number in class40
Numbers22101 - 22140
First run1971

Description

The class 22 is a dual cab general purpose locomotive with a full width body. The body is a single stress-carrying truss structure designed for a buffing load of 300,000 lbf (1,334.5 kN). It consists of a basic underframe of rolled channel longitudinal side members connected by cross members at bogie, power unit and equipment mounting points, as well as at buffer beams and drag boxes. Sides consist of fabricated frames with steel panelling welded to the underframe. The prefabricated cabs are also welded to the underframe and sides to form the box structure. Detachable roof panels with hinged covers provide access to components for maintenance and overhaul.

The bogies were designed by English Electric. They are cast steel bolsterless with fully equalised primary suspension using helical coil springs on underslung beams and three-point secondary rubber cushion suspension to the body. To equalise motor reactions, the AEI-253 motors are all mounted on the inner side of each axle.

The engine is the 1,760 bhp[1] V-8 version of English Electric's RK/V Mk III range, turbocharged and intercooled. It provides a 17% increase in power over the 12SVT Mk II engine fitted to the earlier class 20.[1] The EE822 DC generator is bolted directly to the engine.

History

See also

References
  1. English Electric. "Even better things from English Electric-AEI Traction".
  • Railway Gazette International, August 1971 page 321, "EE-AEI builds Malaya's most powerful diesels"
  • International Railway Journal, September 1971 page 70, "New diesels will be Malaya's most powerful yet"


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