Data from "Tank-lok Litt. S7" 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.) ; and builders' information "SJ Littera S7" in Svenska.lok.se at [
], last accessed 20 April 2024.
Originally built for this privately run railroad, the Y3 design proved attractive for other railroads in Sweden.The Hassleholm-Markaryds Jarnvag (HMJ) bought some in 1921, followed by the Landsrona & Halsingsborgs (L&HJ) in 1928-1929. Motala work numbers were 540-542 in 1915, 598 in 1917, 670-671, 697 in 1921; AB Svenska Järnvägsverkstäderna, Falun works numbers were 341-345 in 1927; NOHAB works numbers were 1669-1671 in 1924, 1850 in 1928.
NB: Locobase uses the external (water side) diameters for the tube and flue heating surface area to match Anglo-North American practice. Measured using the internal (fire side) diameters, tube and flue heating surface area calculated to 67.9 sq m (731 sq ft).
Nationalization in the early 1930s meant a gradual migration of these engines to the SJ (Statens Jarnvagar) over the next decade.
Those that had been counter-balanced for a 12.5 metric ton axle loading (27,558 lb) were eventually rebalanced to the 14.5-ton standard represented by the specifications.
The last of these engines were withdrawn from SJ service by 1970.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Y3/S7 |
Locobase ID | 4067 |
Railroad | Bergslagsbanans (BJ) |
Country | Sweden |
Whyte | 2-6-2T |
Number in Class | 25 |
Road Numbers | 1874-1879, 1489, 1880-1882, 1883-1887, 1624 |
Gauge | Std |
Number Built | 25 |
Builder | several |
Year | 1915 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 12.14 / 3.70 |
Engine Wheelbase (ft / m) | 27.89 / 8.50 |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
Overall Wheelbase (engine & tender) (ft / m) | 27.89 / 8.50 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 31,967 / 14,500 |
Weight on Drivers (lbs / kg) | 95,460 / 43,300 |
Engine Weight (lbs / kg) | 136,686 / 62,000 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 2350 / 8.90 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.20 / 2.90 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 53 / 26.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 55.10 / 1400 |
Boiler Pressure (psi / kPa) | 156.60 / 1080 |
High Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 24.02" / 470x610 |
Tractive Effort (lbs / kg) | 19,860 / 9008.36 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.81 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 100 - 1.89" / 48 |
Flues (number - dia) (in / mm) | 15 - 5" / 127 |
Flue/Tube length (ft / m) | 11.81 / 3.60 |
Firebox Area (sq ft / m2) | 83.96 / 7.80 |
Grate Area (sq ft / m2) | 19.38 / 1.80 |
Evaporative Heating Surface (sq ft / m2) | 900 / 83.60 |
Superheating Surface (sq ft / m2) | 220 / 20.40 |
Combined Heating Surface (sq ft / m2) | 1120 / 104 |
Evaporative Heating Surface/Cylinder Volume | 120.43 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 3035 |
Same as above plus superheater percentage | 3642 |
Same as above but substitute firebox area for grate area | 15,778 |
Power L1 | 6350 |
Power MT | 439.95 |