Data from [] . See also DeGolyer, Vol 63, pp. 147+. Works numbers were 44331-44334 in October 1916 and 44609-44610 in December.
A photo from Bruce Pryor's Narrow Gauge Pictures From Off The Beaten Path ([] (1 Dec 2004)) shows a long, slender boiler with wood-burning Belpaire firebox and a tall stack topped by a basket-shaped spark arrester. The thimble-shaped steam dome is positioned just behind the leading engine set, its external steam pipes feeding the HP cylinders in the trailing engine set.
Madagascar's order included the requirement that these Mallets be able to haul a trailing load 110 tons up a 2 1/2% grade at 12 km/h (7.5 mph).
Data from diagram UG Type 163, Societe Alsacienne de Construction Mecaniques from SACM locomotive book supplied by Dany Machi up at [] as
Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007). Works numbers were 7391-7398 in 1925.
These were superheated variants of the same four-axle Mallet design supplied by Baldwin and described in Locobase 4760. The design had tanks along the sides of the boiler as well as a tender.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 35 | 61 |
Locobase ID | 4760 | 15594 |
Railroad | C.F.Madagascar | C.F.Madagascar |
Country | Madagascar | Madagascar |
Whyte | 0-4-4-0 | 0-4-4-0 |
Number in Class | 6 | 8 |
Road Numbers | 35-40 | 61-68 |
Gauge | metre | metre |
Number Built | 6 | 8 |
Builder | Baldwin | SACM |
Year | 1916 | 1925 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 4.59 / 1.40 | 4.59 / 1.40 |
Engine Wheelbase (ft / m) | 15.32 / 4.67 | 15.32 / 4.67 |
Ratio of driving wheelbase to overall engine wheelbase | 0.30 | 0.30 |
Overall Wheelbase (engine & tender) (ft / m) | 29.92 / 9.12 | 30.17 / 9.20 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 70,548 / 32,000 | 71,804 / 32,570 |
Engine Weight (lbs / kg) | 70,548 / 32,000 | 71,804 / 32,570 |
Tender Loaded Weight (lbs / kg) | 23,038 / 10,450 | 24,063 / 10,915 |
Total Engine and Tender Weight (lbs / kg) | 93,586 / 42,450 | 95,867 / 43,485 |
Tender Water Capacity (gals / ML) | 502 / 1.90 | 554 / 2.10 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 | 3.70 / 3 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 29 / 14.50 | 30 / 15 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 39.80 / 1011 | 39.80 / 1010 |
Boiler Pressure (psi / kPa) | 171.10 / 1180 | 171.10 / 1180 |
High Pressure Cylinders (dia x stroke) (in / mm) | 11.02" x 19.69" / 280x500 | 11.81" x 19.69" / 300x500 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 16.73" x 19.69" / 425x500 | 16.73" x 19.69" / 425x500 |
Tractive Effort (lbs / kg) | 12,187 / 5527.94 | 13,395 / 6075.88 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.79 | 5.36 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 135 - 1.772" / 45 | 73 - 1.614" / 41 |
Flues (number - dia) (in / mm) | 12 - 4.409" / 112 | |
Flue/Tube length (ft / m) | 12.30 / 3.75 | 12.14 / 3.70 |
Firebox Area (sq ft / m2) | 69.32 / 6.44 | 69.43 / 6.45 |
Grate Area (sq ft / m2) | 12.81 / 1.19 | 12.81 / 1.19 |
Evaporative Heating Surface (sq ft / m2) | 767 / 71.26 | 610 / 56.69 |
Superheating Surface (sq ft / m2) | 181 / 16.85 | |
Combined Heating Surface (sq ft / m2) | 767 / 71.26 | 791 / 73.54 |
Evaporative Heating Surface/Cylinder Volume | 352.87 | 244.35 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 2192 | 2192 |
Same as above plus superheater percentage | 2192 | 2696 |
Same as above but substitute firebox area for grate area | 11,861 | 14,612 |
Power L1 | 2523 | 5859 |
Power MT | 315.37 | 719.56 |