Sungei Ujong Rwy 4-4-2 Locomotives in Malaya

Class Details by Steve Llanso of Sweat House Media

Class K (Locobase 1120)

Data originally from "Class K1" at [] (2004). Most specs from Dr. Jonathan DH Smith, "Sungei Ujong Railway steam locomotives" at [], last accessed 22 September 2022.

Works number was 3621 in 1898. The only engine in the class, but it ran until 1926.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID1120
RailroadSungei Ujong Rwy (FMSR)
Number in Class1
Road Numbers4/102
Number Built1
BuilderDubs & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)26,880 / 12,193
Engine Weight (lbs / kg)62,720 / 28,449
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)62,720 / 28,449
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)6819 / 3093.05
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.94
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)10 / 0.93
Evaporative Heating Surface (sq ft / m2)565 / 52.49
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)565 / 52.49
Evaporative Heating Surface/Cylinder Volume239.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1300
Same as above plus superheater percentage1300
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris