Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 72, pp. 168+ and Vol 78, pp. 324+. Works numbers were 58041-58042 in September 1924, 58066-58069 in November, and 58635-58640 in January 1925.
The Nitrate Railways returned to Eddystone four years after it took delivery of the first set of oil-burning Mikados (Locobase 15191), the company added a dozen more, larger and more powerful 2-8-2s. Piston valves measuring 10" (254 mm) admitted superheated steam to the cylinders. A Worthington-Simpson open-type feed water heater helped stretch a coal dollar (or peso) even further.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 66, pp. 386+. See also the EngRails reprint "British Enterprise in South America"--The Activities of Two Important Systems at [] . Works numbers were 53206 in April 1920; 53229, 53246-53249 in May.
Gene Connelly assigns different road numbers to this sextet of superheated, oil-burning Mikados. They were essentially identical to the 1919 logging 2-8-2s described in Locobase 14691, but adopted for a very different service. The superheater dictated the use of piston valves (8"/203 mm diameter).
The British-owned Nitrate Railways was formed in the mid-1860s in the province of Tarapacá and stretched from Pisagua south to connect with several main depots including the well-known nitrate port at Iquique.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 103 | 91 |
Locobase ID | 15277 | 15191 |
Railroad | Nitrate Railways | Nitrate Railways |
Country | Chile | Chile |
Whyte | 2-8-2 | 2-8-2 |
Number in Class | 12 | 6 |
Road Numbers | 103-114 | 91-96 |
Gauge | Std | Std |
Number Built | 12 | 6 |
Builder | Baldwin | Baldwin |
Year | 1924 | 1920 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 12.50 / 3.81 | 12 / 3.66 |
Engine Wheelbase (ft / m) | 28.25 / 8.61 | 27.58 / 8.41 |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 | 0.44 |
Overall Wheelbase (engine & tender) (ft / m) | 56.17 / 17.12 | 52.53 / 16.01 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 31,360 / 14,225 | 28,000 / 12,701 |
Weight on Drivers (lbs / kg) | 123,500 / 56,019 | 110,500 / 50,122 |
Engine Weight (lbs / kg) | 170,000 / 77,111 | 140,000 / 63,503 |
Tender Loaded Weight (lbs / kg) | 110,000 / 49,895 | 110,000 / 49,895 |
Total Engine and Tender Weight (lbs / kg) | 280,000 / 127,006 | 250,000 / 113,398 |
Tender Water Capacity (gals / ML) | 4600 / 17.42 | 5500 / 20.83 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1700 / 6435 | 2000 / 7570 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 | 46 / 23 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 44 / 1118 | 44 / 1118 |
Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 | 18" x 24" / 457x610 |
Tractive Effort (lbs / kg) | 30,127 / 13665.39 | 27,039 / 12264.70 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.10 | 4.09 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 178 - 2" / 51 | 164 - 2" / 51 |
Flues (number - dia) (in / mm) | 27 - 5.375" / 137 | 24 - 5.375" / 137 |
Flue/Tube length (ft / m) | 15.96 / 4.86 | 12.08 / 3.68 |
Firebox Area (sq ft / m2) | 158 / 14.68 | 140 / 13.01 |
Grate Area (sq ft / m2) | 40.50 / 3.76 | 25.50 / 2.37 |
Evaporative Heating Surface (sq ft / m2) | 2239 / 208.09 | 1575 / 146.38 |
Superheating Surface (sq ft / m2) | 490 / 45.54 | 328 / 30.48 |
Combined Heating Surface (sq ft / m2) | 2729 / 253.63 | 1903 / 176.86 |
Evaporative Heating Surface/Cylinder Volume | 284.29 | 222.82 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 7290 | 4590 |
Same as above plus superheater percentage | 8602 | 5370 |
Same as above but substitute firebox area for grate area | 33,559 | 29,484 |
Power L1 | 12,468 | 9761 |
Power MT | 890.27 | 778.98 |