Coahuila y Zacatecas 4-6-0 "Ten-wheeler" Locomotives of 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).

Specifications by Steve Llanso of Sweat House Media
Class7
Locobase ID12706
RailroadCoahuila y Zacatecas
CountryMexico
Whyte4-6-0
Number in Class1
Road Numbers7
Gauge3'
Number Built1
BuilderBurnham, Williams & Co
Year1906
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 7.67'
Engine Wheelbase21.42'
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender)47.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers75000 lbs
Engine Weight105000 lbs
Tender Light Weight75000 lbs
Total Engine and Tender Weight180000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)42 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure180 psi
Cylinders (dia x stroke)17" x 20"
Tractive Effort21056 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56
Heating Ability
Firebox Area71.70 sq. ft
Grate Area19.60 sq. ft
Evaporative Heating Surface1581 sq. ft
Superheating Surface
Combined Heating Surface1581 sq. ft
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 area12906
Power L14651
Power MT410.15

Photos