Dom Pedro Segundo 2-10-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 119 (Locobase 8790)

Data from Lionel Wiener, writing in Cassier's Magazine - an engineering monthly (Volume XXXVIII, #5, October 1910), p 470. See also DeGolyer, Volume 12, p. 133. Works number was 7557

This early decapod was typical of the arrangement, but one of the smallest ever built. It had low drivers and a long wheelbase. In the present engine's case, however, that driving wheelbase was reduced to a rigid one of 9 ft 10 in (3 metres) in by leaving the flanges off the 2nd and 3rd set of drivers and adding 1/4" of play to the fourth axle. Combining that short wheelbase with tracklaying that spread the rails 1/2" wider than true gauge allowed this single deck to negotiate curves with a 500-ft radius.

At the time of delivery, the train was rated at 3,600 tons on level track. Its operating speed was to be 20 mph (32 km/h).

It was out of service by 1907.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID8790
RailroadDom Pedro Segundo
Number in Class1
Road Numbers119
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)17 / 5.18
Engine Wheelbase (ft / m)24.33 / 7.42
Ratio of driving wheelbase to overall engine wheelbase 0.70
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)126,000 / 57,153
Engine Weight (lbs / kg)141,000 / 63,957
Tender Loaded Weight (lbs / kg)83,000 / 37,648
Total Engine and Tender Weight (lbs / kg)224,000 / 101,605
Tender Water Capacity (gals / ML)3500
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 1143
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)22" x 26" / 559x660
Tractive Effort (lbs / kg)33,278 / 15094.66
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Tubes (number - dia) (in / mm)268 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.79 / 3.90
Firebox Area (sq ft / m2)160 / 14.87
Grate Area (sq ft / m2)33.10 / 3.08
Evaporative Heating Surface (sq ft / m2)1943 / 180.58
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1943 / 180.58
Evaporative Heating Surface/Cylinder Volume169.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4634
Same as above plus superheater percentage4634
Same as above but substitute firebox area for grate area22,400
Power L12518
Power MT220.29

All material Copyright ©
Wes Barris