Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 54, p. 293. Works number was 41676 in September 1914.
Fox Brothers bought this wood-burning light Eight-wheeler, which served the U de Y for decades. In 1963 it was relettered and renumbered as Unidos del Sureste #4.
Data from 1947 Locomotive Cyclopedia and from DeGolyer, Vol 54, pp 290-291. Works numbers were 42914-42915 in February 1916.
The first pair of this design burned wood and used a spark-arresting Radley & Hunter cabbage stack. They were sized to meet the requirements of a narrow gauge road with 35 lb/yard (17.5 kg/metre) rails.
The 65 and 66 were sold in 1963 to the Unidos de Sureste as their 250-251. Roger Broggie, Walt Disney's railroad designer, found this and three other locomotives in the Yucatan and bought them in February 1969. (See Locobases 12662 and 14494 for the 2-6-0 and the 4-6-0s that constitute the rest of the Disney stud.)
Like the others, the 251 underwent a number change (to 4), but didn't get its name until December 1971, when its reconstruction was completed. By that time, Walt's indispensable brother Roy, who had declined the honor earlier, had passed on and the 4 was named Roy O Disney.
Data from 1947 Locomotive Cyclopedia and from DeGolyer, Vol 54, pp 290-291. Works numbers were 56387-56388 in April 1923, 58414 in May 1925 and 72206-72207 in 1944.
Locobase 967 shows the first pair of wood-burning Eight-wheelers built to this design for the U de Y in 1916. Seven years later the railroad ordered the same engine design from Eddystone, but specified oil fuel. Engine weight increased by 3 short tons (2.7 metric tons), but the locomotive still had to travel on 35 lb/yard (17.5 kg/metre) rails..
Nineteen years later, Baldwin built two more from the same specifications in 1944. These were the last 4-4-0s to be built by an American manufacturer.
Principal Dimensions by Steve Llanso of Middle Run Media | |||
---|---|---|---|
Class | 4 | 65 | 67 |
Locobase ID | 14492 | 967 | 14981 |
Railroad | Unidos de Yucatan | Unidos de Yucatan | Unidos de Yucatan |
Country | Mexico | Mexico | Mexico |
Whyte | 4-4-0 | 4-4-0 | 4-4-0 |
Number in Class | 1 | 2 | 5 |
Road Numbers | 4 | 65-66 | 67-68, 74, 80-81 |
Gauge | Std | 3' | 3' |
Number Built | 1 | 2 | 5 |
Builder | Baldwin | Baldwin | Baldwin |
Year | 1914 | 1916 | 1923 |
Valve Gear | Stephenson | Stephenson | Stephenson |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 6.50 / 1.98 | 8 / 2.44 | 8 / 2.44 |
Engine Wheelbase (ft / m) | 22.50 / 6.86 | 19.75 / 6.02 | 19.75 / 6.02 |
Ratio of driving wheelbase to overall engine wheelbase | 0.29 | 0.41 | 0.41 |
Overall Wheelbase (engine & tender) (ft / m) | 45.62 / 13.90 | 41.48 / 12.64 | 41.48 / 12.64 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |||
Weight on Drivers (lbs / kg) | 62,000 / 28,123 | 33,000 / 14,969 | 34,000 / 15,422 |
Engine Weight (lbs / kg) | 100,000 / 45,359 | 51,000 / 23,133 | 57,000 / 25,855 |
Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 | 50,000 / 22,680 | 56,500 / 25,628 |
Total Engine and Tender Weight (lbs / kg) | 160,000 / 72,575 | 101,000 / 45,813 | 113,500 / 51,483 |
Tender Water Capacity (gals / ML) | 3000 / 11.36 | 2500 / 9.47 | 2500 / 9.47 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 120 / 454 | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 | 28 / 14 | 28 / 14 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 66 / 1676 | 46 / 1168 | 46 / 1168 |
Boiler Pressure (psi / kPa) | 160 / 1100 | 160 / 1100 | 160 / 1100 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 | 13" x 18" / 330x457 | 13" x 18" / 330x457 |
Tractive Effort (lbs / kg) | 14,292 / 6482.75 | 8994 / 4079.61 | 8994 / 4079.61 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.34 | 3.67 | 3.78 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 234 - 2" / 51 | 124 - 2" / 51 | 124 - 2" / 51 |
Flues (number - dia) (in / mm) | |||
Flue/Tube length (ft / m) | 10.87 / 3.31 | 9.37 / 2.86 | 9.37 / 2.86 |
Firebox Area (sq ft / m2) | 127 / 11.80 | 67 / 6.22 | 67 / 6.22 |
Grate Area (sq ft / m2) | 16.70 / 1.55 | 9.70 / 0.90 | 9.70 / 0.90 |
Evaporative Heating Surface (sq ft / m2) | 1449 / 134.62 | 670 / 62.24 | 670 / 62.27 |
Superheating Surface (sq ft / m2) | |||
Combined Heating Surface (sq ft / m2) | 1449 / 134.62 | 670 / 62.24 | 670 / 62.27 |
Evaporative Heating Surface/Cylinder Volume | 229.64 | 241.88 | 241.88 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 2672 | 1552 | 1552 |
Same as above plus superheater percentage | 2672 | 1552 | 1552 |
Same as above but substitute firebox area for grate area | 20,320 | 10,720 | 10,720 |
Power L1 | 5813 | 4451 | 4451 |
Power MT | 413.40 | 594.71 | 577.22 |