Mexican Petroleum 2-6-0 Locomotives in Mexico


Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 14184)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 49,p. 91. Works numbers were 39193-39194 in January 1913.

Seems only logical that these two little Moguls would be powered by nearly crude oil. The company that bought them was founded by Edward Doheny, a rags-to-riches-to-Teapot Dome Scandal oilman. Doheny already owned California-based Petroleum Development Company when he formed the Mexican Petroleum Company in 1900. He later expanded into the Tuxpan district and set up the Huasteca Petroleum Company. At the time, Pemex claimed 925 sq miles (600,000 acres) in a country where oil finds were described as "flush", i.e., the petroleum spurted out of the wells under its own pressure.

During the 10-year Mexican Revolution, Doheny's 6,000-man private army defended Pemex installations from all combatants. Pemex gathered another 1,234 sq miles (800,000 acres) as Doheny created a holding company (PanAmerican and outstripped all other oil companies in Mexico.

Principal Dimensions by Steve Llanso of Middle Run Media
Class5
Locobase ID14184
RailroadMexican Petroleum
CountryMexico
Whyte2-6-0
Number in Class2
Road Numbers5-6
Gauge3'
Number Built2
BuilderBaldwin
Year1913
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.42 / 4.09
Engine Wheelbase (ft / m)19.92 / 6.07
Ratio of driving wheelbase to overall engine wheelbase 0.67
Overall Wheelbase (engine & tender) (ft / m)42.87 / 13.07
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)52,000 / 23,587
Engine Weight (lbs / kg)64,000 / 29,030
Tender Loaded Weight (lbs / kg)50,000 / 22,680
Total Engine and Tender Weight (lbs / kg)114,000 / 51,710
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1000 / 3785
Minimum weight of rail (calculated) (lb/yd / kg/m)29 / 14.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)14" x 20" / 356x508
Tractive Effort (lbs / kg)13,328 / 6045.49
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.90
Heating Ability
Tubes (number - dia) (in / mm)156 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.04 / 2.76
Firebox Area (sq ft / m2)74.70 / 6.94
Grate Area (sq ft / m2) 9.80 / 0.91
Evaporative Heating Surface (sq ft / m2)806 / 74.91
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)806 / 74.91
Evaporative Heating Surface/Cylinder Volume226.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1568
Same as above plus superheater percentage1568
Same as above but substitute firebox area for grate area11,952
Power L13534
Power MT449.49

All material Copyright © SteamLocomotive.com
Wes Barris