Merida a Peto/United of Yucatan 2-6-0 Locomotives in Mexico


Class Details by Steve Llanso of Sweat House Media

Class 75 (Locobase 16508)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 79, pp. 67+. Works numbers were 60597-60601 in August 1928.

Locobase 12662 showed the little wood-burning Mogul served the Yucatan for over four decades beginning in 1904. In 1908 the MaP was taken into the Unidos de Yucqtan and the Catalina was renumbered 62.

Twenty years later, the 75-78 are described in the 1928 specifications as "exact duplicates of 8 20 D 115, except where otherwise specified." So although they were ordered 24 years after the original engine, they repeated every dimension, but added two tons to the adhesion weight and 2 1/2 tons to the engine weight.

The newer engines also burned oil in a larger tender that held 3,000 US gallons of water and 1,580 gallons of thick crude (12 degrees Baume). Tender empty weight was about 33,000 lb (14,969 kg) and loaded weight rose to 69,000 lb (31,298 kg).

The 62 was scrapped in 1948. 75 and 79 were retired in 1962. The other three were sold to the Unidos de Sureste and renumbered 261-263. Of these, the 260 was sold in February 1969 to the Disney Corporation, renamed Lilly Belle, renumbered 2, and rebuilt in 1971 for operation at Disneyland in Anaheim, CA. See Locobases 967 and 14494 for the 4-4-0 and the two 4-6-0s that also have had second lives on Disney railroads.


Class Catalina a de Casasus (Locobase 12662)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 25, p.232. Works number was 21935 in April 1904 and 60597-60601 in August 1928.

This little wood-burning Mogul served the Yucatan for over four decades. In 1908 the MaP was taken into the Unidos de Yucqtan and the Catalina was renumbered 62.

The 75-78 are described in the 1928 specifications as "exact duplicates of 8 20 D 115, except where otherwise specified." So although they were ordered 24 years after the original engine, they repeated every dimension, but added two tons to the adhesion weight and 2 1/2 tons to the engine weight.

The newer engines also burned oil in a larger tender that held 3,000 US gallons of water and 1,580 gallons of thick crude. Tender empty weight was about 33,000 lb (14,969 kg) and loaded weight rose to 69,000 lb (31,298 kg).

The 62 was scrapped in 1948. 75 and 79 were retired in 1962. The other three were sold to the Unidos de Sureste and renumbered 261-263. Of these, the 260 was sold in February 1969 to the Disney Corporation, renamed Lilly Belle, renumbered 2, and rebuilt in 1971 for operation at Disneyland in Anaheim, CA. See Locobases 967 and 14494 for the 4-4-0 and the two 4-6-0s that also have had second lives on Disney railroads.

Principal Dimensions by Steve Llanso of Middle Run Media
Class75Catalina a de Casasus
Locobase ID16508 12662
RailroadMerida a Peto/United of YucatanMerida a Peto/United of Yucatan
CountryMexicoMexico
Whyte2-6-02-6-0
Number in Class61
Road Numbers75-7912 / 62
Gauge3'3'
Number Built61
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19281903
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.6612 / 3.66
Engine Wheelbase (ft / m)17.92 / 5.4617.92 / 5.46
Ratio of driving wheelbase to overall engine wheelbase 0.67 0.67
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)47,000 / 21,31943,000 / 19,504
Engine Weight (lbs / kg)57,000 / 25,85552,000 / 23,587
Tender Loaded Weight (lbs / kg)45,000 / 20,41245,000 / 20,412
Total Engine and Tender Weight (lbs / kg)102,000 / 46,26797,000 / 43,999
Tender Water Capacity (gals / ML)3000 / 11.362200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1580 / 5980
Minimum weight of rail (calculated) (lb/yd / kg/m)26 / 1324 / 12
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 101640 / 1016
Boiler Pressure (psi / kPa)160 / 1100160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)13" x 18" / 330x45713" x 18" / 330x457
Tractive Effort (lbs / kg)10,343 / 4691.5110,343 / 4691.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.54 4.16
Heating Ability
Tubes (number - dia) (in / mm)154 - 1.5" / 38154 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.08 / 2.46 8.08 / 2.46
Firebox Area (sq ft / m2)60 / 5.5760 / 5.58
Grate Area (sq ft / m2) 8.90 / 0.83 8.90 / 0.83
Evaporative Heating Surface (sq ft / m2)545 / 50.65545 / 50.65
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)545 / 50.65545 / 50.65
Evaporative Heating Surface/Cylinder Volume196.75196.75
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14241424
Same as above plus superheater percentage14241424
Same as above but substitute firebox area for grate area96009600
Power L132543254
Power MT457.90500.50

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