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

Class Details by Steve Llanso of Sweat House Media

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 M a P 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 Sweat House Media
ClassCatalina a de Casasus
Locobase ID12662
RailroadMerida a Peto / United of Yucatan
Number in Class6
Road Numbers12 / 62, 75-79
Number Built6
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)17.92 / 5.46
Ratio of driving wheelbase to overall engine wheebase 0.67
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)43,000 / 19,504
Engine Weight (lbs / kg)52,000 / 23,587
Tender Loaded Weight (lbs / kg)45,000 / 20,412
Total Engine and Tender Weight (lbs / kg)97,000 / 43,999
Tender Water Capacity (gals / ML)2200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)24 / 12
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)13" x 18" / 330x457
Tractive Effort (lbs / kg)10,343 / 4691.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Firebox Area (sq ft / m2)60 / 5.58
Grate Area (sq ft / m2) 8.90 / 0.83
Evaporative Heating Surface (sq ft / m2)545 / 50.65
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)545 / 50.65
Evaporative Heating Surface/Cylinder Volume197.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1424
Same as above plus superheater percentage1424
Same as above but substitute firebox area for grate area9600
Power L13259
Power MT501.27

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Wes Barris