Stockholm-Vasteras-Bergslagens 4-6-0 Locomotives in Sweden
Class Details by Steve Llanso of Sweat House Media
Class H/A6 (Locobase 20211)
Data from Litt-A6-SWB, one of a series of SJ locomotive diagrams archived by Anders Lundbing on [
], last accessed 10 June 2017 (Snabcon AB advertised its tools for mounting RJ45 connectors on bundled cables.)
Nohab produced seven of the eight locomotives in this class. Road numbers 57-60 were works numbers 858-861 in 1910; road numbers 68, 71-72 (works numbers 1054 and 1071-1072 in 1915). The SWB produced the eighth in 1931.
The series of Ten-wheelers (Locobases 20208-20211) built with 520 x 610 cylinders, 220 mm (8.66") piston valves, and 1,720 mm diameter drivers all had relatively low axle loadings. Three more orders with slight differences appear in Locobases 20212-20214.
(NB: Locobase's specifications show the evaporative heating surface area using the tubes' outer diameter (i.e., the water side). The SJ's calculation used the narrower, fire-side diameter of 44.5 mm and 118 mm (1.75" and 4.65"), tube and flue respectively, which produced a total EHS of 116.03 sq m (1,365 sq ft).)
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | H/A6 |
| Locobase ID | 20211 |
| Railroad | Stockholm-Vasteras-Bergslagens (SWB) |
| Country | Sweden |
| Whyte | 4-6-0 |
| Number in Class | 8 |
| Road Numbers | 56-60, 68, 71-72/1687-1694 |
| Gauge | Std |
| Number Built | 8 |
| Builder | Nydqvist & Holm (NOHAB) |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.45 / 4.10 |
| Engine Wheelbase (ft / m) | 27.17 / 8.28 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.50 |
| Overall Wheelbase (engine & tender) (ft / m) | 45.60 / 13.90 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 28,881 / 13,100 |
| Weight on Drivers (lbs / kg) | 86,421 / 39,200 |
| Engine Weight (lbs / kg) | 131,395 / 59,600 |
| Tender Loaded Weight (lbs / kg) | 76,721 / 34,800 |
| Total Engine and Tender Weight (lbs / kg) | 208,116 / 94,400 |
| Tender Water Capacity (gals / ML) | 3643 / 13.80 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 48 / 24 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 67.40 / 1712 |
| Boiler Pressure (psi / kPa) | 171.10 / 1180 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.47" x 24.02" / 520x610 |
| Tractive Effort (lbs / kg) | 21,718 / 9851.13 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.98 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 127 - 1.89" / 48 |
| Flues (number - dia) (in / mm) | 21 - 5" / 127 |
| Flue/Tube length (ft / m) | 13.78 / 4.20 |
| Firebox Area (sq ft / m2) | 118.40 / 11 |
| Grate Area (sq ft / m2) | 25.83 / 2.40 |
| Evaporative Heating Surface (sq ft / m2) | 1363 / 126.60 |
| Superheating Surface (sq ft / m2) | 382 / 35.50 |
| Combined Heating Surface (sq ft / m2) | 1745 / 162.10 |
| Evaporative Heating Surface/Cylinder Volume | 148.97 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4420 |
| Same as above plus superheater percentage | 5392 |
| Same as above but substitute firebox area for grate area | 24,715 |
| Power L1 | 11,329 |
| Power MT | 867.02 |