Built by Hamar and Thune, this batch of tank locomotives was built to supply the new, standard-gauge line. They were, says the Norwegian Railway Club (Norsk Jerbaneklubb) website [], based on the NHJ Class F (itself designated Class 43 by the NSB).
Data from Svein Sando's Railway Site [] (9 June 2004)--(Later link: The Semaphore, accessed for link update 10 July 2022.)-- and the Jernbane (Iron Road) site [
] (originally June 2004, last accessed 30 January 2010). See also DeGolyer, Volume 60, p. 5. See also "Baldwin Locomotives for the Norwegian Government Rys", Locomotive Magazine, Volume 24 (15 January 1917), pp. 16-17. Works numbers were 45601-45606 in May 1917
Supplementing the Class 25a class built in Norway, these engines were not as well-balanced, says the Norwegian Railway Club (Norsk Jerbaneklubb) website [] . The last in this batch was delivered to the Norwegian Hydro Electric Nitrate Co (aka the 16-km Rjukan Railway) and the first soon joined it.
Baldwin delivered three more in 1919 -- works numbers were 51966-51968 in June 1919--which were designated 25c.
See website Norwegian Railway Club (Norsk Jerbaneklubb) website [] and [
] (originally June 2004, last accessed 30 January 2010).
These NMI machines had mostly minor differences from the earlier Class 25s (Locobases 6179, 4072, and 4073), but the big difference was in the introduction of superheater to the basic design.
Principal Dimensions by Steve Llanso of Middle Run Media | |||
---|---|---|---|
Class | Class 25a | Class 25b/25c | Class 25d |
Locobase ID | 4072 | 4073 | 4075 |
Railroad | Randsfjord | Randsfjord | Randsfjord |
Country | Norway | Norway | Norway |
Whyte | 0-6-0T | 0-6-0T | 0-6-0T |
Number in Class | 22 | 9 | 6 |
Road Numbers | 197-200, 223 | 336-340, 344, 381-383 | 420-425 |
Gauge | Std | Std | Std |
Number Built | 22 | 9 | 6 |
Builder | several | Baldwin | NMI |
Year | 1909 | 1917 | 1917 |
Valve Gear | Walschaert | Walschaert | Walschaert |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 10.23 / 3.12 | ||
Engine Wheelbase (ft / m) | 10.23 / 3.12 | ||
Ratio of driving wheelbase to overall engine wheelbase | 1 | ||
Overall Wheelbase (engine & tender) (ft / m) | 10.23 / 3.12 | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |||
Weight on Drivers (lbs / kg) | 77,162 / 35,000 | 79,300 / 35,970 | 79,807 / 36,200 |
Engine Weight (lbs / kg) | 77,162 / 35,000 | 79,300 / 35,970 | 79,807 / 36,200 |
Tender Loaded Weight (lbs / kg) | |||
Total Engine and Tender Weight (lbs / kg) | |||
Tender Water Capacity (gals / ML) | 1410 / 5.34 | ||
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.30 / 1 | 1.30 / 1 | 1.30 / 1 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 43 / 21.50 | 44 / 22 | 44 / 22 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 41.70 / 1060 | 40.55 / 1030 | 41.70 / 1060 |
Boiler Pressure (psi / kPa) | 169.70 / 1170 | 169.70 / 1170 | 169.70 / 1170 |
High Pressure Cylinders (dia x stroke) (in / mm) | 14.17" x 19.69" / 360x500 | 14.17" x 19.69" / 360x500 | 14.17" x 19.69" / 360x500 |
Tractive Effort (lbs / kg) | 13,676 / 6203.34 | 14,064 / 6379.33 | 13,676 / 6203.34 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.64 | 5.64 | 5.84 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 136 - 1.75" / 44 | ||
Flues (number - dia) (in / mm) | |||
Flue/Tube length (ft / m) | 9.84 / 3 | ||
Firebox Area (sq ft / m2) | 60 / 5.57 | ||
Grate Area (sq ft / m2) | 12.59 / 1.17 | 12.70 / 1.18 | 12.59 / 1.17 |
Evaporative Heating Surface (sq ft / m2) | 624 / 57.99 | 668 / 62.06 | 506 / 47.03 |
Superheating Surface (sq ft / m2) | 237 / 22.03 | ||
Combined Heating Surface (sq ft / m2) | 624 / 57.99 | 668 / 62.06 | 743 / 69.06 |
Evaporative Heating Surface/Cylinder Volume | 173.63 | 185.87 | 140.80 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 2137 | 2155 | 2137 |
Same as above plus superheater percentage | 2137 | 2155 | 2820 |
Same as above but substitute firebox area for grate area | 10,182 | ||
Power L1 | 3089 | ||
Power MT | 257.63 |