San Marco y Tecolutla 2-8-0 Locomotives in Mexico


Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 11911)

Data from NdeM 1926ca Locomotive Diagrams supplied in December 2010 by Allen Stanley.

The Interoceanico went to two builders in 1901 for this class. Two of the engines came from Baldwin; they were numbered 3 and 4 and appear in Locobase 11912. The other 5 came from England's Kerr, Stuart and they are shown here.


Class 3 (Locobase 11912)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p. 263 and NdeM 1926ca Locomotive Diagrams supplied in December 2010 by Allen Stanley. Baldwin works numbers were 20384-20385 in April 1902.

The Interoceanico went to two builders in 1901 for this class. Five came from England's Kerr, Stuart and they are shown in Locobase 11911. This pair appear to have preceded the Kerr, Stuarts. They had a few more tubes, a little higher boiler pressure, larger firebox.

Principal Dimensions by Steve Llanso of Middle Run Media
Class13
Locobase ID11911 11912
RailroadSan Marco y TecolutlaSan Marco y Tecolutla
CountryMexicoMexico
Whyte2-8-02-8-0
Number in Class52
Road Numbers1-2, 73-75 / 142-143, 73-753-4/144-145
Gauge3'3'
Number Built52
BuilderKerr, Stuart & CoBurnham, Williams & Co
Year19041902
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.92 / 3.3310.92 / 3.33
Engine Wheelbase (ft / m)17.67 / 5.3917.17 / 5.23
Ratio of driving wheelbase to overall engine wheelbase 0.62 0.64
Overall Wheelbase (engine & tender) (ft / m)42.58 / 12.98
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)84,880 / 38,50187,000 / 39,463
Engine Weight (lbs / kg)98,460 / 44,66195,000 / 43,091
Tender Loaded Weight (lbs / kg)70,265 / 31,87270,265 / 31,872
Total Engine and Tender Weight (lbs / kg)168,725 / 76,533165,265 / 74,963
Tender Water Capacity (gals / ML)3000 / 11.363000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1920 / 72671920 / 7267
Minimum weight of rail (calculated) (lb/yd / kg/m)35 / 17.5036 / 18
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)38 / 96538 / 965
Boiler Pressure (psi / kPa)175 / 1210180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x50816" x 20" / 406x508
Tractive Effort (lbs / kg)20,042 / 9090.9120,615 / 9350.82
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.24 4.22
Heating Ability
Tubes (number - dia) (in / mm)170 - 2" / 51179 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.54 / 4.4314.50 / 4.42
Firebox Area (sq ft / m2)73.60 / 6.8483.80 / 7.79
Grate Area (sq ft / m2)16.87 / 1.5716.87 / 1.57
Evaporative Heating Surface (sq ft / m2)1368 / 127.141437 / 133.55
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1368 / 127.141437 / 133.55
Evaporative Heating Surface/Cylinder Volume294.19309.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29523037
Same as above plus superheater percentage29523037
Same as above but substitute firebox area for grate area12,88015,084
Power L141384550
Power MT429.91461.20

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