Data from Wiener, Articulated Locomotives (1930); and "Nitrate Railways-Design 119", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [], et seq, p. 59. . First batch had BP works numbers 6291-6293; 6481-6483) were delivered in 1928.
Two batches of mammoth Double Mikado Garratts for the 20-mile (32.2 km) Iquique-Carpas section on 4% ruling grade with 200-ft radius curves. Note the unusual "over-square" cylinder diameter/stroke ratio and the use of a round-topped boiler.
In one test run, an 88-axle train "was actually on three curves at the same time. They proved capable of pulling a max load of 360 tons. As often proved the case, the Beyer-Garratts reduced both fuel (in this case, oil) and water consumption as well as train and shop crew costs compared to earlier motive power. Moreover, they continued the tradition of using boilers that "steam wonderfully and are a proof that it is not the amount of heating surface that counts, but where it is palced in relation to the grate."
Retired in 1959 in favor of diesels.
NB: Tube length is an estimate based on the calculation of tube surface area by subtracting reported firebox heating surface from reported total evaporative heating surface.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 120 |
Locobase ID | 581 |
Railroad | Nitrate Railways |
Country | Chile |
Whyte | 2-8-2+2-8-2 |
Number in Class | 6 |
Road Numbers | 120-122, 123-125 |
Gauge | 3'6" |
Number Built | 6 |
Builder | Beyer, Peacock |
Year | 1926 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 24 / 7.32 |
Engine Wheelbase (ft / m) | 45 / 13.72 |
Ratio of driving wheelbase to overall engine wheelbase | 0.53 |
Overall Wheelbase (engine & tender) (ft / m) | 71.75 / 21.87 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 40,320 / 18,289 |
Weight on Drivers (lbs / kg) | 314,720 / 142,755 |
Engine Weight (lbs / kg) | 419,216 / 190,153 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | 419,216 / 190,153 |
Tender Water Capacity (gals / ML) | 6600 / 25 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1692 / 6404.20 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 66 / 33 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 42 / 1067 |
Boiler Pressure (psi / kPa) | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 20" / 559x508 (4) |
Tractive Effort (lbs / kg) | 78,362 / 35544.45 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 299 - 2" / 51 |
Flues (number - dia) (in / mm) | 50 - 5.375" / 137 |
Flue/Tube length (ft / m) | 13.53 / 4.12 |
Firebox Area (sq ft / m2) | 276 / 25.64 |
Grate Area (sq ft / m2) | 68.80 / 6.39 |
Evaporative Heating Surface (sq ft / m2) | 3346 / 310.85 |
Superheating Surface (sq ft / m2) | 744 / 69.12 |
Combined Heating Surface (sq ft / m2) | 4090 / 379.97 |
Evaporative Heating Surface/Cylinder Volume | 190.13 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 13,760 |
Same as above plus superheater percentage | 16,237 |
Same as above but substitute firebox area for grate area | 65,136 |
Power L1 | 9086 |
Power MT | 509.18 |