Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 49, p. 103. Works numbers were 40168-40169 in July 1913.
These wood-burning Consolidations served the Yucatan for more than 40 years. Like many rural narrow-gauge lines, the U de Y was lightly built with 35 lb/yard (17.5 kg/metre) rail. Moreover, said the specs, the builder was to "[p]rovide sufficient space between flues on account of bad water." Strength of the unit was a concern too: "The top row of flues should not be too close to corner of flue sheet." No measurements accompany this caution.
The 19 was retired in 1960 while the 20 was sold in 1963 to Unidos del Sureste, which renumbered it 280.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | 18 |
Locobase ID | 14188 |
Railroad | Unidos de Yucatan |
Country | Mexico |
Whyte | 2-8-0 |
Number in Class | 2 |
Road Numbers | 18-19 |
Gauge | 3' |
Number Built | 2 |
Builder | Baldwin |
Year | 1913 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 10.58 / 3.22 |
Engine Wheelbase (ft / m) | 18.08 / 5.51 |
Ratio of driving wheelbase to overall engine wheelbase | 0.59 |
Overall Wheelbase (engine & tender) (ft / m) | 44.87 / 13.68 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 80,000 / 36,287 |
Engine Weight (lbs / kg) | 90,000 / 40,823 |
Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
Total Engine and Tender Weight (lbs / kg) | 150,000 / 68,039 |
Tender Water Capacity (gals / ML) | 3000 / 11.36 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 33 / 16.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 38 / 965 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 20" / 406x508 |
Tractive Effort (lbs / kg) | 20,615 / 9350.82 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.88 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 136 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 14.98 / 4.57 |
Firebox Area (sq ft / m2) | 62 / 5.76 |
Grate Area (sq ft / m2) | 16 / 1.49 |
Evaporative Heating Surface (sq ft / m2) | 1123 / 104.33 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1123 / 104.33 |
Evaporative Heating Surface/Cylinder Volume | 241.51 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 2880 |
Same as above plus superheater percentage | 2880 |
Same as above but substitute firebox area for grate area | 11,160 |
Power L1 | 3513 |
Power MT | 387.24 |