Deli Spoorweg Mij 2-8-4 Locomotives in Indonesia

Class Details by Steve Llanso of Sweat House Media

Class DSM45 (Locobase 4988)

Data from, a site for the Ambarawa Railway Museum maintained by Rob Dickinson; and E Lassueur, "Recent Locomotives for the Dutch Indies Railways," Locomotive Magazine, Volume XXVIII [28] (14 October 1922), pp. 335-338. Werskpoor works number were 414-417.

See Indra Krishnamurti at [] for building dates and numbers both of predecessor railways and the Indonesian State Railways. Krishnamurti shows 1917 as the building date.

Lassueur commented that replacing the 0-6-4Ts

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID4988
RailroadDeli Spoorweg Mij
Number in Class4
Road Numbers45-48
Number Built4
Valve Gear
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)19,842 / 9000
Weight on Drivers (lbs / kg)78,925 / 35,800
Engine Weight (lbs / kg)132,277 / 60,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)132,277 / 60,000
Tender Water Capacity (gals / ML)1452 / 5.50
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.40 / 3.10
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)39.40 / 1000
Boiler Pressure (psi / kPa)174 / 12
High Pressure Cylinders (dia x stroke) (in / mm)17.91" x 18.9" / 455x480
Tractive Effort (lbs / kg)22,758 / 10322.87
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.47
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)24.76 / 2.30
Evaporative Heating Surface (sq ft / m2)883 / 82
Superheating Surface (sq ft / m2)327 / 30.40
Combined Heating Surface (sq ft / m2)1210 / 112.40
Evaporative Heating Surface/Cylinder Volume160.23
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4308
Same as above plus superheater percentage5471
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris