Data from "Rebuilt 0-6-2 Tank Loco Gt. Central Ry", Locomotive Magazine, Volume XXII [22], No 282 (15 February 1916),
10 N5's (Locobase 6962) were fitted with George Robinson's design of a superheater from 1915-1923. The relatively meager amount of superheater area did not offset the sizable loss of small tubes. Another change removed the trailing axle's radial axle boxes and their curved guides in favor of a simpler pony truck joined by a radial arm to a central pivot.
Although the rebuild wasn't unsuccessful, only the ten were converted and they were rebuilt with saturated boilers within a decade or two.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | N5 - superheated |
| Locobase ID | 20531 |
| Railroad | Great Central |
| Country | Great Britain |
| Whyte | 0-6-2T |
| Number in Class | 10 |
| Road Numbers | 1000 |
| Gauge | Std |
| Number Built | |
| Builder | Gorton |
| Year | 1915 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 22.50 / 6.86 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 39,984 / 18,136 |
| Weight on Drivers (lbs / kg) | 121,520 / 55,121 |
| Engine Weight (lbs / kg) | 145,600 / 66,043 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2400 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 68 / 34 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 61 / 1549 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 26" / 457x660 |
| Tractive Effort (lbs / kg) | 18,781 / 8518.93 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.47 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 102 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 15 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 11.58 / 3.53 |
| Firebox Area (sq ft / m2) | 99 / 9.20 |
| Grate Area (sq ft / m2) | 18.40 / 1.71 |
| Evaporative Heating Surface (sq ft / m2) | 880 / 81.75 |
| Superheating Surface (sq ft / m2) | 113 / 10.50 |
| Combined Heating Surface (sq ft / m2) | 993 / 92.25 |
| Evaporative Heating Surface/Cylinder Volume | 114.92 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2944 |
| Same as above plus superheater percentage | 3268 |
| Same as above but substitute firebox area for grate area | 17,582 |
| Power L1 | 5081 |
| Power MT | 276.54 |