Drury (1993) makes no mention of this Twelve-wheeler trio, shown here in its earlier saturated-steam configuration. The long wheelbase and the long stroke typical of the arrangement shows in these as well. Clearly, the railroad thought enough of them to put in some flues and the result is described in Locobase 7089.
These two were scrapped in September 1926 (852) and August 1932 (851).
Drury (1993) makes no mention of this Twelve-wheeler trio, shown here in its superheated form and in Locobase 7090 in its earlier saturated-steam configuration. When the engine was superheated, it lost some heating surface area as often happened, but gained 26 sq ft of arch tubes as part of its firebox heating surface.
Perhaps surprisingly, given the effort made to modernize the design, 850 was scrapped in November 1927, only a year after 851.
| Specifications by Steve Llanso of Sweat House Media | ||
|---|---|---|
| Class | I1-44 | I1-44 - superheated |
| Locobase ID | 7090 | 7089 |
| Railroad | Nashville, Chattanooga & St. Louis (NC&StL) | Nashville, Chattanooga & St. Louis (NC&StL) |
| Country | USA | USA |
| Whyte | 4-8-0 | 4-8-0 |
| Number in Class | 3 | 1 |
| Road Numbers | 850-852 | 850 |
| Gauge | Std | Std |
| Number Built | 3 | |
| Builder | Schenectady | NC&StL |
| Year | 1897 | |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 15.75 / 4.80 | 15.75 / 4.80 |
| Engine Wheelbase (ft / m) | 26.75 / 8.15 | 26.75 / 8.15 |
| Ratio of driving wheelbase to overall engine wheebase | 0.59 | 0.59 |
| Overall Wheelbase (engine & tender) (ft / m) | 53.83 / 16.41 | 53.83 / 16.41 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 154,000 / 69,853 | 154,000 / 69,853 |
| Engine Weight (lbs / kg) | 193,000 / 87,543 | 193,000 / 87,543 |
| Tender Loaded Weight (lbs / kg) | 108,000 | 108,000 |
| Total Engine and Tender Weight (lbs / kg) | 301,000 | 301,000 |
| Tender Water Capacity (gals / ML) | 5000 / 18.94 | 5000 / 18.94 |
| Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) | 10 / 9.10 | 10 / 9.10 |
| Minimum weight of rail (calculated) (lb/yd) | 64 | 64 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 56 / 1422 | 56 / 1422 |
| Boiler Pressure (psi / kPa) | 170 / 11.70 | 170 / 11.70 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23" x 32" / 584x813 | 23" x 32" / 584x813 |
| Tractive Effort (lbs / kg) | 43,680 / 19812.94 | 43,680 / 19812.94 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.53 | 3.53 |
| Heating Ability | ||
| Firebox Area (sq ft / m2) | 208.50 / 19.38 | 232.50 / 21.61 |
| Grate Area (sq ft / m2) | 35 / 3.25 | 35 / 3.25 |
| Evaporative Heating Surface (sq ft / m2) | 2928 / 272.12 | 2358 / 219.14 |
| Superheating Surface (sq ft / m2) | 320 / 29.74 | |
| Combined Heating Surface (sq ft / m2) | 2928 / 272.12 | 2678 / 248.88 |
| Evaporative Heating Surface/Cylinder Volume | 190.28 | 153.24 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 5950 | 5950 |
| Same as above plus superheater percentage | 5950 | 6664 |
| Same as above but substitute firebox area for grate area | 35,445 | 44,268 |
| Power L1 | 4094 | 6600 |
| Power MT | 234.43 | 377.93 |