Vittoria a Minas 4-6-2 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 34 (Locobase 15132)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 79, pp. 248+.. Works numbers were 61226 in February 1930 and 61623 in May 1931.

Bi-fuel (wood or coal) superheated Pacifics with 8" (203 mm) piston valves. As small as they were, the pair strove for thermal efficiency. In addition to the generous amount of superheater area, the design used a Worthington No 1-BL feed water heater. (See Wes Barris's discussion of the appliance at [].)

Curve radii traveled over by these locomotives were 75 metres (246 feet) on the main line and 60 metres (197 feet) on the switches and sidings.

The small but handsome passenger engines were meant to be showpieces, according to the painting instructions. The entire engine and tender were to be "shiny black" except for:

The tender to have "bottle green" rectangles at the sides and back with rounded corners and red striping on outside edge "and between these stripes there is to be one stripe of chrome yellow."

The outside cab panels to be painted bottle green; inside cab walls also to be bottle green and the windows varnished outside.

Dome and sand box to have "stripes same as for tender". The body portions between stripes painted bottle green.

Front part of pilot beam and back part of tender frame to be painted bright red.

Wheel tires (engine and tender) to be painted light grey.

Lettering and numbers in chrome yellow with shading in red as railway company's full-size drawings.

The letters on the cab sides were VM in bronze mongram.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15132
RailroadVittoria a Minas (CVM)
Number in Class1
Road Numbers34-35
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m)24 / 7.32
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)47.79 / 14.57
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)61,500 / 27,896
Engine Weight (lbs / kg)93,500 / 42,411
Tender Loaded Weight (lbs / kg)51,000 / 23,133
Total Engine and Tender Weight (lbs / kg)144,500 / 65,544
Tender Water Capacity (gals / ML)2200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)34 / 17
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)15,122 / 6859.23
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Tubes (number - dia) (in / mm)74 - 2" / 51
Flues (number - dia) (in / mm)15 - 5.375" / 137
Flue/Tube length (ft / m)14.50 / 4.42
Firebox Area (sq ft / m2)93 / 8.64
Grate Area (sq ft / m2)26 / 2.42
Evaporative Heating Surface (sq ft / m2)956 / 88.81
Superheating Surface (sq ft / m2)240 / 22.30
Combined Heating Surface (sq ft / m2)1196 / 111.11
Evaporative Heating Surface/Cylinder Volume233.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4420
Same as above plus superheater percentage5304
Same as above but substitute firebox area for grate area18,972
Power L110,666
Power MT1147.05

All material Copyright ©
Wes Barris