Staatsspoorwegen 2-8-8-0 Locomotives in Indonesia


Class Details by Steve Llanso of Sweat House Media

Class DD51 (Locobase 3642)

Wiener (1930) for data. Works numbers were 58723-58734 in 1919.

Typical US Mallet design, adapted for the Cape gauge and for Javanese conditions. Firebox included 13 sq ft (1.2 sq m)of arch tubes. narrowview.railfan.net posts a photo and data table for this class that has much more evaporative heating surface. (217.2 sq m/2,337 sq ft EHS, 47 sq m/506 SHS). Otherwise the specifications are the same ...

See Indra Krishnamurti at [], where two classes of Alco 2-8-8-0s are shown, the earlier class DD50 and these DD51s.


Class DD52 (Locobase 3641)

Wiener (1930) for data. Probably built to the design delivered by Alco two years before, but with slightly different tube dimensions and a superheater.

See Indra Krishnamurti at [] . He shows three batches -- Hanomag in 1923 (10221-10223) and Werkspoor in 1923 (538-541) and Hartmann in 1924 (4586-4588). The Hartmanns had lower engine numbers than the Werkspoors.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassDD51DD52
Locobase ID3642 3641
RailroadStaatsspoorwegenStaatsspoorwegen
CountryIndonesiaIndonesia
Whyte2-8-8-02-8-8-0
Number in Class1210
Road Numbers1209-1220/DD5101-51121250-1260/DD5201-5210
Gauge3'6""3'6""
Number Built1210
BuilderAlco-Brooksseveral
Year19221924
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.75 / 3.5811.78 / 3.59
Engine Wheelbase (ft / m)37.92 / 11.5631.14 / 9.49
Ratio of driving wheelbase to overall engine wheebase 0.31 0.38
Overall Wheelbase (engine & tender) (ft / m)38.25 / 11.66
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)184,500 / 83,688195,001 / 88,451
Tender Loaded Weight (lbs / kg)96,000 / 43,54595,800 / 43,454
Total Engine and Tender Weight (lbs / kg)302,500 / 137,212307,801 / 139,616
Tender Water Capacity (gals / ML)4500 / 17.054900 / 18.56
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)8 / 79 / 8
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 1941 / 20.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.80 / 110243.50 / 1106
Boiler Pressure (psi / kPa)200 / 13.80200.20 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)17.5" x 24" / 445x61017.72" x 24.02" / 450x610
Low Pressure Cylinders (dia x stroke) (in / mm)26.5" x 24" / 673x61027.56" x 24.02" / 700x610
Tractive Effort (lbs / kg)39,729 / 18020.7941,750 / 18937.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.64 4.67
Heating Ability
Tubes (number - dia) (in / mm)157 - 2" / 51142 - 2.165" / 55
Flues (number - dia) (in / mm)24 - 5.375" / 13724 - 5" / 127
Flue/Tube length (ft / m)19 / 5.7919 / 5.79
Firebox Area (sq ft / m2)152 / 14.13128.04 / 11.90
Grate Area (sq ft / m2)44.70 / 4.1544.12 / 4.10
Evaporative Heating Surface (sq ft / m2)1549 / 143.962094 / 194.60
Superheating Surface (sq ft / m2)636 / 59.11697 / 64.80
Combined Heating Surface (sq ft / m2)2185 / 203.072791 / 259.40
Evaporative Heating Surface/Cylinder Volume231.84305.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation89408833
Same as above plus superheater percentage11,53311,041
Same as above but substitute firebox area for grate area39,21632,042
Power L176557883
Power MT731.77712.98

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