Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 10, p. 236; 11, p. 122. Works numbers were 6017 in January 1882, 6111 in March, 6478 in November, 7129 in January 1884
This Eight-wheeler quartet was bought by Ybarra & Company in Merida in the Yucatan to equip three different lines - The Tecoh belonged to the Merida a Peto, the Delfina O de Diaz to the Merida a Cakini, and the last two - Conkal and Merida - to the Merida a Valladolid. The lines were all brought together under the Unidos de Yucatan banner. The Delfina was sold to Glarra & Company from U de Y in 1906 and renamed Chocol'; it was later sold to Peninsular.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Tecoh |
| Locobase ID | 11790 |
| Railroad | Merida a Peto, a Calkini, a Valladolid |
| Country | Mexico |
| Whyte | 4-4-0 |
| Number in Class | 4 |
| Road Numbers | 2 / 1 / 1- 2 |
| Gauge | 3' |
| Number Built | 4 |
| Builder | Burnham, Parry, Williams & Co |
| Year | 1882 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.17 / 2.19 |
| Engine Wheelbase (ft / m) | 18.25 / 5.56 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 24,000 / 10,886 |
| Engine Weight (lbs / kg) | 37,000 / 16,783 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 20 / 10 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 |
| Tractive Effort (lbs / kg) | 6093 / 2763.74 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.94 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 113 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.81 / 2.69 |
| Firebox Area (sq ft / m2) | 52 / 4.83 |
| Grate Area (sq ft / m2) | 8.20 / 0.76 |
| Evaporative Heating Surface (sq ft / m2) | 439 / 40.80 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 439 / 40.80 |
| Evaporative Heating Surface/Cylinder Volume | 210.05 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1148 |
| Same as above plus superheater percentage | 1148 |
| Same as above but substitute firebox area for grate area | 7280 |
| Power L1 | 3512 |
| Power MT | 645.22 |