Dala-Ockelbo-Norrsundet Articulated Locomotives in Sweden
Class Details by Steve Llanso of Sweat House Media
Class 8-12 (Locobase 5069)
See [
] (11 July 2004) for data.
Possibly the only Mallets to run on a Swedish railway, this class (Atlas works #113, 114 & 1 more) was delivered in 1910 to serve the oddly sized Dala -Ockelbo - Norrsundets JSrnvSg (DONJ). This narrow gauge (891 mm) railway between Linghed and Norrsundet, 86 kilometres long, closed in 1970.
In 1983, A 6-km (3.6-mile) part of the DONJ between Jadraas and Tallas was revived as a museum road and the three Mallets formed part of its rolling stock. Two (8 & 12) actually operate, although the 8 entered long-term overhaul in 2014 when the boiler was deemed to be in poor condition.
Masma of Mariestad began restoration of the boiler from October 2015-February 2016. In February 2017, the DONJ sent the boiler back to Masma to be mated to a new firebox. Then the overhaul was suspended to allow work on more critical projects and to raise funds to continue a 2 million kronr (equivalent to US$220,000 in April 2018) update.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 8-12 |
| Locobase ID | 5069 |
| Railroad | Dala-Ockelbo-Norrsundet (DONJ) |
| Country | Sweden |
| Whyte | 0-6-6-0 |
| Number in Class | 3 |
| Road Numbers | 8, 11, 12 |
| Gauge | 891 mm |
| Number Built | 3 |
| Builder | Atlas |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | 34.78 / 10.60 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 127,427 / 57,800 |
| Engine Weight (lbs / kg) | 127,427 / 57,800 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 127,427 / 57,800 |
| Tender Water Capacity (gals / ML) | 2112 / 8 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.20 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 39.40 / 1001 |
| Boiler Pressure (psi / kPa) | 170.70 / 1180 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12.99" x 19.69" / 330x500 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 19.69" x 19.69" / 500x500 |
| Tractive Effort (lbs / kg) | 17,050 / 7733.76 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 7.47 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 18.29 / 1.70 |
| Evaporative Heating Surface (sq ft / m2) | 1151 / 106.97 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1151 / 106.97 |
| Evaporative Heating Surface/Cylinder Volume | 381.10 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3122 |
| Same as above plus superheater percentage | 3122 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |