New Orleans, Texas & Mexico 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class E- 69 - 19.7 (Locobase 7763)

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

Although delivered by Dickson as a saturated-steam engine (Locobase 7762), this Eight-wheeler received a useful degree of superheater enhancement to go with its relatively generous firebox heating surface. The diagram notes that 935 was scrapped in January 1934.


Class E- 69 - 20.7 (Locobase 7762)

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

This set of Eight-wheelers represent later development of the classic 4-4-0 as a local-service passenger engine.

Specifications by Steve Llanso of Sweat House Media
ClassE- 69 - 19.7E- 69 - 20.7
Locobase ID7763 7762
RailroadNew Orleans, Texas & Mexico (NOT & M/MP)New Orleans, Texas & Mexico (NOT & M/MP)
CountryUSAUSA
Whyte4-4-04-4-0
Number in Class26
Road Numbers936935-940
GaugeStdStd
Number Built6
BuilderDicksonDickson
Year19071907
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59 8.50 / 2.59
Engine Wheelbase (ft / m)23.83 / 7.2623.83 / 7.26
Ratio of driving wheelbase to overall engine wheebase 0.36 0.36
Overall Wheelbase (engine & tender) (ft / m)58.25 / 17.7556.58 / 17.25
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,400 / 41,00588,600 / 40,188
Engine Weight (lbs / kg)137,400 / 62,324133,800 / 60,691
Tender Loaded Weight (lbs / kg)115,400 / 52,345120,000 / 54,431
Total Engine and Tender Weight (lbs / kg)252,800 / 114,669253,800 / 115,122
Tender Water Capacity (gals / ML)6000 / 22.736000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2300 / 8.702300 / 8.70
Minimum weight of rail (calculated) (lb/yd / kg/m)75 / 37.5074 / 37
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 175369 / 1753
Boiler Pressure (psi / kPa)190 / 13.10200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x66018" x 26" / 457x660
Tractive Effort (lbs / kg)19,717 / 8943.4920,755 / 9414.32
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.58 4.27
Heating Ability
Firebox Area (sq ft / m2)161 / 14.96161 / 14.96
Grate Area (sq ft / m2)30 / 2.7930 / 2.79
Evaporative Heating Surface (sq ft / m2)1450 / 134.761853 / 172.21
Superheating Surface (sq ft / m2)376 / 34.94
Combined Heating Surface (sq ft / m2)1826 / 169.701853 / 172.21
Evaporative Heating Surface/Cylinder Volume189.35241.98
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation57006000
Same as above plus superheater percentage68976000
Same as above but substitute firebox area for grate area37,01432,200
Power L116,0907983
Power MT784.79397.28