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 Wheelbase (ft)14
Engine Wheelbase (ft)25.08
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender) (ft)56.75
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)142,550
Engine Weight (lbs)188,070
Tender Loaded Weight (lbs)352,330
Total Engine and Tender Weight (lbs)540,400
Tender Water Capacity (gals)6000
Tender Fuel Capacity (oil/coal) (gals/tons)3300
Minimum weight of rail (calculated) (lb/yd)79
Geometry Relating to Tractive Effort
Driver Diameter (in)67
Boiler Pressure (psi)210
High Pressure Cylinders (dia x stroke) (in)21" x 26"
Tractive Effort (lbs)30,547
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.67
Heating Ability
Firebox Area (sq ft)165.70
Grate Area (sq ft)43.90
Evaporative Heating Surface (sq ft)1771
Superheating Surface (sq ft)354
Combined Heating Surface (sq ft)2125
Evaporative Heating Surface/Cylinder Volume169.91
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9219
Same as above plus superheater percentage10,786
Same as above but substitute firebox area for grate area40,712
Power L113,017
Power MT603.95

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.