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.
This set of Eight-wheelers represent later development of the classic 4-4-0 as a local-service passenger engine.
| Specifications | ||
|---|---|---|
| Class | E- 69 - 19.7 | E- 69 - 20.7 |
| Locobase ID | 7763 | 7762 |
| Railroad | New Orleans, Texas & Mexico (NOT & M/MP) | New Orleans, Texas & Mexico (NOT & M/MP) |
| Whyte | 4-4-0 | 4-4-0 |
| Road Numbers | 936 | 935-940 |
| Gauge | Std | Std |
| Builder | Dickson | Dickson |
| Year | 1907 | 1907 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 8.50' | 8.50' |
| Engine Wheelbase | 23.83' | 23.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.36 | 0.36 |
| Overall Wheelbase (engine & tender) | 58.25' | 56.58' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 90400 lbs | 88600 lbs |
| Engine Weight | 137400 lbs | 133800 lbs |
| Tender Light Weight | 115400 lbs | 120000 lbs |
| Total Engine and Tender Weight | 252800 lbs | 253800 lbs |
| Tender Water Capacity | 6000 gals | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 2300 gals | 2300 gals |
| Minimum weight per yard of rail on which locomotive could run | 75 lb rail | 74 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 69" |
| Boiler Pressure | 190 psi | 200 psi |
| Cylinders (dia x stroke) | 18" x 26" | 18" x 26" |
| Tractive Effort | 19717 lbs | 20755 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.58 | 4.27 |
| Heating Ability | ||
| Firebox Area | 161 sq. ft | 161 sq. ft |
| Grate Area | 30 sq. ft | 30 sq. ft |
| Evaporative Heating Surface | 1450 | 1853 |
| Superheating Surface | 376 | |
| Combined Heating Surface | 1826 | 1853 |
| Evaporative Heating Surface/Cylinder Volume | 189.35 | 241.98 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 5700 | 6000 |
| Same as above plus superheater percentage | 6840 | 6000 |
| Same as above but substitute firebox area for grate area | 36708 | 32200 |
| Power L1 | 16090 | 7983 |
| Power MT | 784.79 | 397.28 |
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