El Sindicato de Obras Públicas 2-6-0 Locomotives in Chile

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 10753)

Data from Charles King, "The Chilian [sic] State Railways," The Railway Magazine (March 1908), pp. 209-214; see also the introductory article in the same journal at February 1908, pp.143-150; and Martin Coombs, "2-6-0 d/w ?, cyls. ?, built by Borsig in 1906-7 for the Sindicato de Obras Públicas.", Chilean steam locomotives lists, Part 3 Metre-Gauge locos (October 2020), pP. 165-166 -available at [], last accessed 25 April 2021. Works numbers were 6010 and 6289.

Martin Coombs explained that several private contractors in Chile formed a syndicate to bid on state construction projects. The SOP succeeded in contracting several parts of the the Ferrocarril Arica - La Paz (FCALP), 18 km of the broad-gauge Rucapehen a Tome line and a similar branch line connecting Pua to Curacautin. However, Coombs noted, the SOP's contracts were suspended in late 1907 for lack of progress on their projects.

A particular requirement for this Mogul design was the ability to negotiate 3-chain (198-ft) curves. One way in which this was accomplished was having the connecting (main) rod drive on the last of the three coupled axles. Steam-raising capability wasn't sacrificed, however, as the small drivers allowed a relatively large firebox to ride above the axles without setting up a high center of gravity. According to King, the resulting engine "...proved to be, for its size, exceedingly powerful and smooth in running." Its principal bailiwicks were the Talca-Constitucion branch and short lines leaving Chanaral.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10753
RailroadEl Sindicato de Obras Públicas
Number in Class2
Road Numbers3-4
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.87 / 2.40
Engine Wheelbase (ft / m)13.94 / 4.25
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)17,919 / 8128
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)62,159 / 28,195
Tender Loaded Weight (lbs / kg)35,274 / 16,000
Total Engine and Tender Weight (lbs / kg)97,433 / 44,195
Tender Water Capacity (gals / ML)1584 / 6
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.20 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.30 / 1100
Boiler Pressure (psi / kPa)169.70 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)14.17" x 21.65" / 360x550
Tractive Effort (lbs / kg)14,481 / 6568.48
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)14.53 / 1.35
Evaporative Heating Surface (sq ft / m2)820 / 76.20
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)820 / 76.20
Evaporative Heating Surface/Cylinder Volume207.51
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2466
Same as above plus superheater percentage2466
Same as above but substitute firebox area for grate area
Power L1
Power MT

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