Balfour, Williamson & Company 2-6-2 Locomotives in Chile

Class Details by Steve Llanso of Sweat House Media

Class Keryma (Locobase 15188)

Data from DeGolyer, Volume 66, pp. 378+. See Locobase 10996 for a brief description of tank-frame locomotives. Works number was 51870 in June 1919.

This tank-frame engine (a Baldwin specialty) was originally ordered on 4 May 1917 by the International Engineering & Tracing Company, the Russian import. When Kerensky's Provisional Government took over for the fallen Czar Nicholas II, slews of orders were cancelled.

Most locomotives were redirected by their builders and this engine was resold to BW & Company, a major British-owned trading company in Brazil.

The 1 had three tanks, one of 210 US gallons (795 litres) between the engine frame rails that formed the sides of the tank and the other two in the usual side tank positions and holding a total of 265 gallons (1,003 litres).

The specs declared that the locomotive had to have coal and water capacity sufficient to run 7 1/2 miles (12 km). Their trains consisted of 25 loaded cars of nitrate, each weighing 3 1/2 metric tons (3.85 short tons), to be hauled up a 1 1/2% grade.

"Keryma" was a nitrate office for the Compania Salitera Keryma at Iquique.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID15188
RailroadBalfour, Williamson & Company
Number in Class1
Road Numbers1
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.33 / 1.62
Engine Wheelbase (ft / m) 5.33 / 1.62
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m) 5.33 / 1.62
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)34,000 / 15,422
Engine Weight (lbs / kg)34,000 / 15,422
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)34,000 / 15,422
Tender Water Capacity (gals / ML)1600 / 6.06
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)19 / 9.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)28 / 711
Boiler Pressure (psi / kPa)165 / 11.40
High Pressure Cylinders (dia x stroke) (in / mm)10" x 14" / 254x356
Tractive Effort (lbs / kg)7013 / 3181.05
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.85
Heating Ability
Tubes (number - dia) (in / mm)70 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.67 / 2.64
Firebox Area (sq ft / m2)26 / 2.42
Grate Area (sq ft / m2) 5.50 / 0.51
Evaporative Heating Surface (sq ft / m2)301 / 27.96
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)301 / 27.96
Evaporative Heating Surface/Cylinder Volume236.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation908
Same as above plus superheater percentage908
Same as above but substitute firebox area for grate area4290
Power L12608
Power MT507.32

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