New Orleans, Texas & Mexico 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class TN-57 - 233 (Locobase 7753)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.


Class TN-63 - 26.0 (Locobase 7758)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Probably among the last engines produced by this minor component of the Alco consortium, the sextet of Ten-wheelers obviously were superheated later than 1903. In 1931, driver diameter grew from 63" to 64".


Class TN-69 - 29.6 (Locobase 7761)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This quintet of latter-day Ten-wheelers had a relatively long stride under an average-sized boiler and grate.

Specifications by Steve Llanso of Sweat House Media
ClassTN-57 - 233TN-63 - 26.0TN-69 - 29.6
Locobase ID7753 7758 7761
RailroadNew Orleans, Texas & Mexico (NOT & M/MP)New Orleans, Texas & Mexico (NOT & M/MP)New Orleans, Texas & Mexico (NOT & M/MP)
CountryUSAUSAUSA
Whyte4-6-04-6-04-6-0
Number in Class165
Road Numbers233301-306385-389
GaugeStdStdStd
Number Built165
BuilderAlco-CookeDicksonAlco
Year190619031921
Valve GearStephensonStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase11.50'13'15'
Engine Wheelbase21.33'23.58'26.92'
Ratio of driving wheelbase to overall engine wheebase 0.54 0.55 0.56
Overall Wheelbase (engine & tender)47.54'47.50'62.25'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers93000 lbs127000 lbs140000 lbs
Engine Weight123000 lbs162500 lbs187000 lbs
Tender Light Weight115000 lbs109200 lbs153000 lbs
Total Engine and Tender Weight238000 lbs271700 lbs340000 lbs
Tender Water Capacity5000 gals6500 gals7500 gals
Tender Fuel Capacity (oil/coal)2300 gals1870 gals3000 gals
Minimum weight of rail (calculated)52 lb/yard71 lb/yard78 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"63"69"
Boiler Pressure180 psi185 psi200 psi
Cylinders (dia x stroke)18" x 24"20" x 26"21.5" x 26"
Tractive Effort20872 lbs25959 lbs29611 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.46 4.89 4.73
Heating Ability
Firebox Area135 sq. ft158 sq. ft180 sq. ft
Grate Area24.50 sq. ft30.20 sq. ft32.70 sq. ft
Evaporative Heating Surface1507 sq. ft1451 sq. ft2145 sq. ft
Superheating Surface265 sq. ft485 sq. ft
Combined Heating Surface1507 sq. ft1716 sq. ft2630 sq. ft
Evaporative Heating Surface/Cylinder Volume213.20153.48196.34
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation441055876540
Same as above plus superheater percentage441064257717
Same as above but substitute firebox area for grate area243003361542480
Power L15279950515600
Power MT375.43495.00736.97


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