Araraquara 4-10-2 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 401 (Locobase 12744)

Data from Locomotiva a vapor Schwartzkopff - 4-10-2" on the EFA Planta website at [], last accessed 14 March 2021. Este material foi publicado no Centro-Oeste Textos n'6 a partir de material enviado por Germano Pauli Mendes, Santos, SP. (That is: Germano Pauli Mendes sent information that was published in the Centro-Oeste Textos Number 6). Works numbers were 10817-10819 in 1938.

These were impressively scaled locomotives for the metre gauge. Mendes explained that EF de A deliberately asked for an engine that had standard-gauge dimensions. At the same time, the trio had to negotiate curve radii as tight as 90 metres. Both boiler and grate measured up to the large proportions called for; the boiler included a small combustion chamber and a Greshan feedwater heater.

All three engines had names of engineers. In order they were: Eng Socrates de Andrade, Eng. Balduino de Almeida, and Eng. Edmundo Busch Varela.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID12744
Number in Class3
Road Numbers401-403
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.53 / 4.12
Engine Wheelbase (ft / m)37.73 / 11.50
Ratio of driving wheelbase to overall engine wheelbase 0.36
Overall Wheelbase (engine & tender) (ft / m)61.27 / 18.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)176,370 / 80,000
Engine Weight (lbs / kg)235,894 / 107,000
Tender Loaded Weight (lbs / kg)105,822 / 48,000
Total Engine and Tender Weight (lbs / kg)341,716 / 155,000
Tender Water Capacity (gals / ML)4752 / 18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)255.30 / 17.60
High Pressure Cylinders (dia x stroke) (in / mm)22.83" x 24.02" / 580x610 (3)
Tractive Effort (lbs / kg)81,503 / 36969.18
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.16
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)66.74 / 6.20
Evaporative Heating Surface (sq ft / m2)3111 / 289
Superheating Surface (sq ft / m2)1259 / 117
Combined Heating Surface (sq ft / m2)4370 / 406
Evaporative Heating Surface/Cylinder Volume182.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation17,039
Same as above plus superheater percentage21,980
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris