Coahuila y Zacatecas 4-6-0 Locomotives in Mexico

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 12706)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 29, p 245. Works number was 29869 in December 1906

Apparently a Pacific wasn't really the answer for the C y Z's motive power needs; as noted in Locobase 12705, the 6 would be converted to a Ten-wheeler in 1910. In 1906, the C y Z bought a 4-6-0 from Baldwin that had same power dimensions but slight changes in the firebox (smaller) and boiler (larger).

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID12706
RailroadCoahuila y Zacatecas
Number in Class1
Road Numbers7
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.67 / 2.34
Engine Wheelbase (ft / m)21.42 / 6.53
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft / m)47.50 / 14.48
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)75,000 / 34,019
Engine Weight (lbs / kg)105,000 / 47,627
Tender Loaded Weight (lbs / kg)75,000 / 34,019
Total Engine and Tender Weight (lbs / kg)180,000 / 81,646
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 20" / 432x508
Tractive Effort (lbs / kg)21,056 / 9550.85
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56
Heating Ability
Firebox Area (sq ft / m2)71.70 / 6.66
Grate Area (sq ft / m2)19.60 / 1.82
Evaporative Heating Surface (sq ft / m2)1581 / 146.93
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1581 / 146.93
Evaporative Heating Surface/Cylinder Volume300.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3528
Same as above plus superheater percentage3528
Same as above but substitute firebox area for grate area12,906
Power L14651
Power MT410.15

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