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

Class Details by Steve Llanso of Sweat House Media

Class TN-67- 30.5 (Locobase 7816)

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

This Baldwin passenger power was bigger than the NO, T & M's Dickson-built engines delivered in the same year. They received a more modest superheater installation, but later on were fitted with two Nicholson thermic syphons.

Specifications by Steve Llanso of Sweat House Media
ClassTN-67- 30.5
Locobase ID7816
RailroadNew Orleans, Texas & Mexico
Number in Class2
Road Numbers361-362
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase14'
Engine Wheelbase25.08'
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender)56.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers142550 lbs
Engine Weight188070 lbs
Tender Light Weight352330 lbs
Total Engine and Tender Weight540400 lbs
Tender Water Capacity6000 gals
Tender Fuel Capacity (oil/coal)3300 gals
Minimum weight of rail (calculated)79 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter67"
Boiler Pressure210 psi
Cylinders (dia x stroke)21" x 26"
Tractive Effort30547 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.67
Heating Ability
Firebox Area165.70 sq. ft
Grate Area43.90 sq. ft
Evaporative Heating Surface1771 sq. ft
Superheating Surface354 sq. ft
Combined Heating Surface2125 sq. ft
Evaporative Heating Surface/Cylinder Volume169.91
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9219
Same as above plus superheater percentage10786
Same as above but substitute firebox area for grate area40712
Power L113017
Power MT603.95

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