Data from "Heavy 'Decapod' Freight Engines for Argentina", The Railway Times,Volume 93 (11 January 1908), p 37-38; and Albert H Bone, "Some Recent Designs of Locomotives for Service on Continental Railways", Cassier's Magazine, 1910, pp. 561-609.
These rather small Decapods went into service in Argentina in the first decade of the 20th century. They were the heaviest locomotives buillt in Great Britain up to that point. To move it from the Darlington Works to Liverpool, Stephensons broke down the completed locomotive to pieces that would fit on a railway flat wagon (North American flatcar). Even then, the "Decapods Special" claimed both tracks because some elements (e.g. the tender) couldn't clear the loading gauge on one track. Running on a Sunday morning at a maximum speed of 20 mph (32 kph), the special train reached Liverpool without incident.
The design did have a Belpaire firebox, a long wheelbase, and a good amount of adhesion. Small drivers under a low running board, a noticeable gap between the running board and the boiler, thick-collared smokebox, and notional cab easily reveal the British origins of this engine.
After trials on the AGW, the railway ordered five more.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | unknown |
Locobase ID | 8945 |
Railroad | FC Argentine Great Western |
Country | Argentina |
Whyte | 2-10-0 |
Number in Class | 6 |
Road Numbers | |
Gauge | 5'6" |
Number Built | 6 |
Builder | Robert Stephenson & Co |
Year | 1905 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 19 / 5.79 |
Engine Wheelbase (ft / m) | 27.17 / 8.28 |
Ratio of driving wheelbase to overall engine wheelbase | 0.70 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 32,816 |
Weight on Drivers (lbs / kg) | 158,704 / 71,987 |
Engine Weight (lbs / kg) | 178,080 / 80,776 |
Tender Loaded Weight (lbs / kg) | 101,584 / 46,078 |
Total Engine and Tender Weight (lbs / kg) | 279,664 / 126,854 |
Tender Water Capacity (gals / ML) | 7200 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 53 / 26.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 51 / 1295 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19.5" x 28" / 495x711 |
Tractive Effort (lbs / kg) | 31,941 / 14488.21 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.97 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 286 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 15 / 4.57 |
Firebox Area (sq ft / m2) | 194 / 18.03 |
Grate Area (sq ft / m2) | 36 / 3.35 |
Evaporative Heating Surface (sq ft / m2) | 2440 / 226.77 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 2440 / 226.77 |
Evaporative Heating Surface/Cylinder Volume | 252.11 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 6480 |
Same as above plus superheater percentage | 6480 |
Same as above but substitute firebox area for grate area | 34,920 |
Power L1 | 5391 |
Power MT | 374.44 |