Data from:
Svein Sando's Railway Site [] (9 June 2004)--(Later link: The Semaphore, accessed for link update 10 July 2022.)--and the Jernbane (Iron Road) site http://jernbane.net (June 2004). Wheelbase from Locomotive Magazine (4 April 1903), p.241.
Jernbane doesn't say when the NSB took over these saddle-tankers from the Dunderland Iron Ore Company, but the later of the two engines retired on 7 November 1955.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Class 53 |
| Locobase ID | 6197 |
| Railroad | DIOC / NSB |
| Country | Norway |
| Whyte | 0-6-0ST |
| Number in Class | 2 |
| Road Numbers | A1-A2 / 490-491 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Robert Stephenson & Co |
| Year | 1902 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15 / 4.57 |
| Engine Wheelbase (ft / m) | 15 / 4.57 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 15 / 4.57 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 87,964 / 39,900 |
| Engine Weight (lbs / kg) | 87,964 / 39,900 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1082 / 4.10 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.90 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 134.90 / 930 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 14,677 / 6657.38 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.99 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 75 / 6.97 |
| Grate Area (sq ft / m2) | 13.45 / 1.25 |
| Evaporative Heating Surface (sq ft / m2) | 887 / 82.43 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 887 / 82.43 |
| Evaporative Heating Surface/Cylinder Volume | 158.82 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1814 |
| Same as above plus superheater percentage | 1814 |
| Same as above but substitute firebox area for grate area | 10,118 |
| Power L1 | 2439 |
| Power MT | 183.38 |