New Orleans, Texas & Mexico 4-6-0 "Ten-Wheeler" Locomotives in 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 Rail Data Exchange.

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.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassTN-67- 30.5
Locobase ID7816
RailroadNew Orleans, Texas & Mexico
CountryUSA
Whyte4-6-0
Number in Class2
Road Numbers361-362
GaugeStd
Number Built2
BuilderNOTM
Year1916
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.27
Engine Wheelbase (ft / m)25.08 / 7.64
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender) (ft / m)56.75 / 17.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)142,550 / 64,660
Engine Weight (lbs / kg)188,070 / 85,307
Tender Loaded Weight (lbs / kg)352,330 / 159,814
Total Engine and Tender Weight (lbs / kg)540,400 / 245,121
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)3300 / 12.50
Minimum weight of rail (calculated) (lb/yd / kg/m)79 / 39.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)67 / 1702
Boiler Pressure (psi / kPa)210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)21" x 26" / 533x660
Tractive Effort (lbs / kg)30,547 / 13855.90
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.67
Heating Ability
Firebox Area (sq ft / m2)165.70 / 15.40
Grate Area (sq ft / m2)43.90 / 4.08
Evaporative Heating Surface (sq ft / m2)1771 / 164.59
Superheating Surface (sq ft / m2)354 / 32.90
Combined Heating Surface (sq ft / m2)2125 / 197.49
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