Halmstad-Nassjo 4-6-0 Locomotives in Sweden
Class Details by Steve Llanso of Sweat House Media
Class P7/A7 (Locobase 20215)
Data from Litt-A7, 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.) Works number was 1041 in 1914.
This engine incorporated some of the basic layout and dimensions of the H and H3 classes described in Locobases 20209-20214. Its design, however, introduced a boiler with more tubes each of which was 20 cm longer, slightly tweaked the cylinder volume, and adopted Deeley's variation of the Walschaert radial valve gear. See Locobase 2287 for a description of this valve gear. Piston valves measuring 200 mm (7.9") admitted steam to the cylinders.
(NB: Locobase's specifications show the evaporative heating surface area using the tubes' outer diameter (i.e., the water side).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | P7/A7 |
| Locobase ID | 20215 |
| Railroad | Halmstad-Nassjo (HNJ)/Statens Jarnvagar (SJ) |
| Country | Sweden |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 51/1549 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Nydqvist & Holm (NOHAB) |
| Year | 1914 |
| Valve Gear | Deeley |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.45 / 4.10 |
| Engine Wheelbase (ft / m) | 27.72 / 8.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 46.16 / 14.07 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 27,558 / 12,500 |
| Weight on Drivers (lbs / kg) | 85,098 / 38,600 |
| Engine Weight (lbs / kg) | 133,600 / 60,600 |
| Tender Loaded Weight (lbs / kg) | 74,075 / 33,600 |
| Total Engine and Tender Weight (lbs / kg) | 207,675 / 94,200 |
| Tender Water Capacity (gals / ML) | 3696 / 14 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 47 / 23.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 67.70 / 1720 |
| Boiler Pressure (psi / kPa) | 171.10 / 1180 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.08" x 24.02" / 510x610 |
| Tractive Effort (lbs / kg) | 20,806 / 9437.45 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.09 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 143 - 2.008" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5" / 127 |
| Flue/Tube length (ft / m) | 14.44 / 4.40 |
| Firebox Area (sq ft / m2) | 136.70 / 12.70 |
| Grate Area (sq ft / m2) | 26.91 / 2.50 |
| Evaporative Heating Surface (sq ft / m2) | 1619 / 150.40 |
| Superheating Surface (sq ft / m2) | 393 / 36.50 |
| Combined Heating Surface (sq ft / m2) | 2012 / 186.90 |
| Evaporative Heating Surface/Cylinder Volume | 183.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4604 |
| Same as above plus superheater percentage | 5525 |
| Same as above but substitute firebox area for grate area | 28,067 |
| Power L1 | 12,805 |
| Power MT | 995.21 |