Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 28, p. 59 . Works numbers were 25870 in May 1905, 25959 in June.
Grades and curves on this railway were among the most challenging in the world (see Locobase 10073 for details) and engineers on the GaQ struggled to find the right balance of flexibility and power to tackle the profile. These two Mallets' answer to the specification used two short wheelbase engines under a Belpaire firebox and boiler. LP cylinders led the front engine, HP cylinders powered the rear one.
They were not regarded as a great success, probably because the lack of any steering trucks limited their speed. In the following year, Baldwin would produce an octet of powerful narrow-gauge Consolidations that tried a different combination; see Locobase 12960.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | 17 |
Locobase ID | 12961 |
Railroad | Guayaquil & Quito |
Country | Ecuador |
Whyte | 0-6-6-0 |
Number in Class | 2 |
Road Numbers | 17-18 |
Gauge | 3'6" |
Number Built | 2 |
Builder | Burnham, Williams & Co |
Year | 1905 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 6.83 / 2.08 |
Engine Wheelbase (ft / m) | 20.33 / 6.20 |
Ratio of driving wheelbase to overall engine wheelbase | 0.34 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 110,000 / 49,895 |
Engine Weight (lbs / kg) | 110,000 / 49,895 |
Tender Loaded Weight (lbs / kg) | 70,000 / 31,752 |
Total Engine and Tender Weight (lbs / kg) | 180,000 / 81,647 |
Tender Water Capacity (gals / ML) | 3500 / 13.26 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 31 / 15.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 37 / 940 |
Boiler Pressure (psi / kPa) | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 12.5" x 20" / 318x508 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 19" x 20" / 483x508 |
Tractive Effort (lbs / kg) | 20,042 / 9090.91 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.49 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 155 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 15.50 / 4.72 |
Firebox Area (sq ft / m2) | 106 / 9.85 |
Grate Area (sq ft / m2) | 18 / 1.67 |
Evaporative Heating Surface (sq ft / m2) | 1357 / 126.12 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1357 / 126.12 |
Evaporative Heating Surface/Cylinder Volume | 477.70 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 3600 |
Same as above plus superheater percentage | 3600 |
Same as above but substitute firebox area for grate area | 21,200 |
Power L1 | 3546 |
Power MT | 426.41 |