Allard Dolfus Sillard et Wiriot 2-6-0 Locomotives in Chile

Class Details by Steve Llanso of Sweat House Media

Class Luz (Locobase 13990)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p. 196. Works number was 37894 in June 1912.

Identical to the 20 engines supplied by Baldwin to the Chilean State Railways in 1907 (Locobase 13127), this Mogul was employed by a well-known Paris-based construction firm that had recently supervised the expansion of Uruguay's port of Montevideo. They had then won the contract to execute similar work in Argentina's Mar de Plata..The firm then secured a contract in 1910 to build a naval dock at Talcahuano as part of Chile's naval expansion.

The specs display an interest in bottom-line power in requiring the Luz to haul 1,700 short tons on the level at 10 mph (16 km/h). No grades or curves appear in the order.

Note preserving off-topic fun fact: Allard, Dollfus, Sillard and Wiriot maintained a durable presence in Argentina, at least to the point of sponsoring a football (soccer) club. John Ashdown's survey of football clubs named for people in the Guardian (16 February 2010) quoted Russell Yong, on the source of Club AtlTtico Aldosivi "[The name] originates from the first two letters of the last names of the four original founders. Allard, Dollfus, Sillard and Wiriott [sic] v the W changing to a V due to there being no W key on the telegraph that originally announced the club's formation." (See []).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13990
RailroadAllard Dolfus Sillard et Wiriot
Number in Class1
Road Numbers
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.92 / 4.24
Engine Wheelbase (ft / m)21.25 / 6.48
Ratio of driving wheelbase to overall engine wheelbase 0.66
Overall Wheelbase (engine & tender) (ft / m)42
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)79,000 / 35,834
Engine Weight (lbs / kg)98,500 / 44,679
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)158,500 / 71,895
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)16,845 / 7640.77
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.69
Heating Ability
Tubes (number - dia) (in / mm)186 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.72 / 3.27
Firebox Area (sq ft / m2)102.50 / 9.53
Grate Area (sq ft / m2)16.80 / 1.56
Evaporative Heating Surface (sq ft / m2)1138 / 105.76
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1138 / 105.76
Evaporative Heating Surface/Cylinder Volume180.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2688
Same as above plus superheater percentage2688
Same as above but substitute firebox area for grate area16,400
Power L13909
Power MT327.26

All material Copyright ©
Wes Barris