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 Wheelbase (ft)11.501315
Engine Wheelbase (ft)21.3323.5826.92
Ratio of driving wheelbase to overall engine wheebase 0.54 0.55 0.56
Overall Wheelbase (engine & tender) (ft)47.5447.5062.25
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)93,000127,000140,000
Engine Weight (lbs)123,000162,500187,000
Tender Loaded Weight (lbs)115,000109,200153,000
Total Engine and Tender Weight (lbs)238,000271,700340,000
Tender Water Capacity (gals)500065007500
Tender Fuel Capacity (oil/coal) (gals/tons)230018703000
Minimum weight of rail (calculated) (lb/yd)527178
Geometry Relating to Tractive Effort
Driver Diameter (in)576369
Boiler Pressure (psi)180185200
High Pressure Cylinders (dia x stroke) (in)18" x 24"20" x 26"21.5" x 26"
Tractive Effort (lbs)20,87225,95929,611
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.46 4.89 4.73
Heating Ability
Firebox Area (sq ft)135158180
Grate Area (sq ft)24.5030.2032.70
Evaporative Heating Surface (sq ft)150714512145
Superheating Surface (sq ft)265485
Combined Heating Surface (sq ft)150717162630
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 area24,30033,61542,480
Power L15279950515,600
Power MT375.43495.00736.97


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