Data from "North Staffordshire Railway", The Locomotive Magazine, Vol XVII (15 December 1911), p. 257; "Old and New Tank Locomotives, North Staffordshire Railway", Volume XVIII [18], No. 236 (15 April 1912), p. 69; and "Four-Coupled Tank, North Staffordshire Railway", Engineer, Volume CXIII [113] (22 March 1912), pp. 302 (diagram), 306 (description).
A septet of Atlantic passenger tanks with big Belpaire fireboxes and an unusually high superheater area, but a very small boiler for the cylinder volume. Its cylinders placed between inside created a very clean profile.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | K |
| Locobase ID | 20028 |
| Railroad | North Staffordshire |
| Country | Great Britain |
| Whyte | 4-4-2T |
| Number in Class | 7 |
| Road Numbers | 8, 45-46, 55, 13-14, 38 |
| Gauge | Std |
| Number Built | 7 |
| Builder | Stoke Works |
| Year | 1911 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.50 / 2.90 |
| Engine Wheelbase (ft / m) | 31.12 / 9.49 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.31 |
| Overall Wheelbase (engine & tender) (ft / m) | 31.12 / 9.49 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | 152,320 / 69,091 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 72 / 1829 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 19,644 / 8910.38 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 112 - 1.875" / 48 |
| Flues (number - dia) (in / mm) | 18 - 5" / 127 |
| Flue/Tube length (ft / m) | 11.23 / 3.42 |
| Firebox Area (sq ft / m2) | 133 / 12.36 |
| Grate Area (sq ft / m2) | 21 / 1.95 |
| Evaporative Heating Surface (sq ft / m2) | 1020 / 94.76 |
| Superheating Surface (sq ft / m2) | 261 / 24.25 |
| Combined Heating Surface (sq ft / m2) | 1281 / 119.01 |
| Evaporative Heating Surface/Cylinder Volume | 107.89 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3360 |
| Same as above plus superheater percentage | 4032 |
| Same as above but substitute firebox area for grate area | 25,536 |
| Power L1 | 8193 |
| Power MT | |