Data from Titre Exposition universelle internationale de 1878 a Paris. Rapports du jury internationale..Volume Groupe VI - Classe 64. Rapport sur le materiel des chemins de fer. p. 54 (cnum.cnam.fr/CGI/fpage.cgi?8XAE277-11.1/54/100/312/0/0 (accessed 1 September 2005) table. See also "Locomotives at the Paris Exhibition - X - Sweden", Engineering, Volume 26 (15 November 1878), pp. 390, 393; and "0-6-0 Tank Locomotive, Gothland Railway, Sweden", Locomotive Magazine, Volume XXVI [26] (15 March 1920), pp. 61-62.
These were the three engines that established the locomotive shed for the 57-km- (35.4 mi) long Gotland when it opened in 1878; they were suitably designed for the line's 30 lb/yard (15 kg/metre) rail. LM commented that Nydquist & Holm's entry in the 1878 Paris Exposition drew attention "less by reason of any novelties than its general excellence of workmanship and sound principles of design." According to a brief account in the Exposition Jury's report (p 173), the design had a Belpaire firebox. This description was borne out by the illustration published 43 years later in LM's 1920 report. Uneven driver spacing placed the first two 4 1/2 feet (1.37 m) apart, the last two 5 1/2 feet(1.68 m) apart as they made room for the firebox. Laminated springs on the first two axles were equalized by uneven-length compensating beams, the sought-for "three point" stance achieved by a transverse spring at the trailing end. Engineering's detailed report from 1878 described the Allan valve motion as "well proportioned and arranged, being located outside with the eccentrics driven by a return crank." Valve spindles moved back and forth along the outside edge of the valve chest, operating the valves within. This location, 4 1/2" (114 mm) outside of the slide valve centerlines, ensured that the spinidles and the straight links at the ends of the eccentric rods would remain in "correct alignment" without having to use a offset dummy spindle.
Principal Dimensions by Steve Llanso of Sweat House Media | |
|---|---|
| Class | 6 |
| Locobase ID | 7389 |
| Railroad | Gotland |
| Country | Sweden |
| Whyte | 0-6-0T |
| Number in Class | 3 |
| Road Numbers | 6 |
| Gauge | 891 mm |
| Number Built | 3 |
| Builder | Nydqvist & Holm (NOHAB) |
| Year | 1877 |
| Valve Gear | Allan |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 10 / 3.05 |
| Engine Wheelbase (ft / m) | 10 / 3.05 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 10 / 3.05 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 11,648 / 5283 |
| Weight on Drivers (lbs / kg) | 34,833 / 15,800 |
| Engine Weight (lbs / kg) | 34,833 / 15,800 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 34,833 / 15,800 |
| Tender Water Capacity (gals / ML) | 438 / 1.66 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.34 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 19 / 9.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 39 / 991 |
| Boiler Pressure (psi / kPa) | 145 / 10 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 16" / 279x406 |
| Tractive Effort (lbs / kg) | 6118 / 2775.08 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.69 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 126 - 1.654" / 42 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 7.68 / 2.34 |
| Firebox Area (sq ft / m2) | 44.80 / 4.16 |
| Grate Area (sq ft / m2) | 6.24 / 0.58 |
| Evaporative Heating Surface (sq ft / m2) | 463 / 43.01 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 463 / 43.01 |
| Evaporative Heating Surface/Cylinder Volume | 263.09 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 905 |
| Same as above plus superheater percentage | 905 |
| Same as above but substitute firebox area for grate area | 6496 |
| Power L1 | 3679 |
| Power MT | 698.54 |