Wiener (1930) for data. See also "Recent Locomotives for the Java Railways", Locomotive Magazine, Volume 29, No 366 (15 February 1923), pp. 29-30.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.
Data from Wiener (1930) ; and "Mallet Locomotives, Java State Rys", Locomotive Magazine, Volume 31 (15 May 1925), pp. 140-141.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.
Probably built to the design delivered by Alco two years before, but with slightly different tube dimensions and a superheater. They also used plate frames instead of the Alco bar frames. LM commented on the cab's layout in this 3/4 gauge engine, which "clearly show how well the designers have studied the satisfactory operation of the these giant locomotives, for they rank in this category when compared to British locomotives for the normal gauge."
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | DD51 | DD52 |
Locobase ID | 3642 | 3641 |
Railroad | Staatsspoorwegen | Staatsspoorwegen |
Country | Indonesia | Indonesia |
Whyte | 2-8-8-0 | 2-8-8-0 |
Number in Class | 12 | 10 |
Road Numbers | 1209-1220/DD5101-5112 | 1250-1260/DD5201-5210 |
Gauge | 3'6" | 3'6" |
Number Built | 12 | 10 |
Builder | Alco-Brooks | several |
Year | 1922 | 1924 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 11.75 / 3.58 | 11.78 / 3.59 |
Engine Wheelbase (ft / m) | 37.92 / 11.56 | 31.14 / 9.49 |
Ratio of driving wheelbase to overall engine wheelbase | 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 / 83,688 | 195,001 / 88,451 |
Engine Weight (lbs / kg) | 206,500 / 93,667 | 212,001 / 96,162 |
Tender Loaded Weight (lbs / kg) | 96,000 / 43,545 | 95,800 / 43,454 |
Total Engine and Tender Weight (lbs / kg) | 302,500 / 137,212 | 307,801 / 139,616 |
Tender Water Capacity (gals / ML) | 4500 / 17.05 | 4900 / 18.56 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8 / 7.30 | 9 / 8 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 38 / 19 | 41 / 20.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 43.80 / 1113 | 43.50 / 1106 |
Boiler Pressure (psi / kPa) | 200 / 1380 | 200.20 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 24" / 445x610 | 17.72" x 24.02" / 450x610 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 26.5" x 24" / 673x610 | 27.56" x 24.02" / 700x610 |
Tractive Effort (lbs / kg) | 39,729 / 18020.79 | 41,750 / 18937.50 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.64 | 4.67 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 157 - 2" / 51 | 142 - 2.165" / 55 |
Flues (number - dia) (in / mm) | 24 - 5.375" / 137 | 24 - 5" / 127 |
Flue/Tube length (ft / m) | 19 / 5.79 | 19 / 5.79 |
Firebox Area (sq ft / m2) | 152 / 14.12 | 128.04 / 11.90 |
Grate Area (sq ft / m2) | 44.70 / 4.15 | 44.12 / 4.10 |
Evaporative Heating Surface (sq ft / m2) | 2337 / 217.11 | 2094 / 194.60 |
Superheating Surface (sq ft / m2) | 636 / 59.09 | 697 / 64.80 |
Combined Heating Surface (sq ft / m2) | 2973 / 276.20 | 2791 / 259.40 |
Evaporative Heating Surface/Cylinder Volume | 349.78 | 305.42 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 8940 | 8833 |
Same as above plus superheater percentage | 10,817 | 11,041 |
Same as above but substitute firebox area for grate area | 36,784 | 32,042 |
Power L1 | 8406 | 7883 |
Power MT | 803.56 | 712.98 |